- $53.99 Scientific Instruments Co. Professional Slide Rule No. 250 Circular JAPAN 1962
- $199.99 Antique Henri Chatelain Calculigraphe Circular Slide Rule - Pocket Watch Shape
- $39.00 Vintage Sama & Etani Concise Circular Slide Rule 600 US GOVERNMENT PROPERTY 60s
- $1999.99 Antique 1870's Brass Engineer's Circular Slide Rule R.C. Lepage / Alfred Apps
- $18.00 Vintage Circular Slide Rule Japan w/case
- $62.99 Pickett Circular 103ES Slide Rule Markup Calculator Leather Case Vintage Retro
- $115.00 Radio Transmission Line Calculator PH Smith Chart Circular Slide Rule Mega Rule
- $48.95 VTG ESSO Oil Aviation True Course Air Speed Correction Chart Circular Slide Rule
- $60.00 Pickett Dial Rule, Circular Slide Rule 101-C, Lietz 3077, w/Leather Case
- $49.95 GILSON Binary 8" Circular Slide Rule, VTG, with Original Manual & Cover
- $40.00 Rare Money Clip, Circular Slide Rule Style Flight Calculator
- $41.00 Concise Ruler Circular Slide Rule No. 270N 100812 100mm Made IN JAPAN
- $279.99 S.I.C. Scientific Instruments Co. 1610 Professional Circular Slide Rule
- $34.87 Concise Ruler Circular Slide Rule No. 300 100829 Made IN JAPAN 110mm
- $1250.00 Dempster Rotarule Model No. AA Circular Slide Rule w/ Leather Case
- $69.00 Vintage Circular Slide Rule KL-1 USSR Calculator Mathematical Soviet Instrument
- $68.00 Pickett 101-C Circular Slide Rule Dial Rule Case & Manual Hartung
- $199.97 Pickett 108ES Circular Slide Rule with Case - Trig Vintage Japan 108-ES
- $24.00 TDW Services, INC. Circular Slide Rule No. 6429 w. Case / Instr. - Concise Japan
- $23.49 Vintage Circular Midget Slide Rule Copyright 1931 / 1936 Made In USA
- $18.99 1934 Mascot Circular Slide Rule 3” + Pouch & Manual
- $389.99 PICKETT 110-ES CIRCULAR SLIDE RULE & LEATHER CASE W/ INSTRUCTION BOOK 24 SCALES
- $49.99 Fearns Inches-Millimetres Conversion Calculator - Circular Slide Rule
- $29.99 VTG 1960 MODEL CTCS-552 CONCISE CIRCULAR SLIDE RULE & CONVERSION TABLES & MANUAL
- $19.99 American Concrete Pipe Association Pipe Selector and Circular Slide Rule ©1974
- $30.72 Concise Ruler Circular Slide Rule No. 270N 100812 Made IN JAPAN 100mm NEW
- $39.00 Vintage Sama & Etani Concise Circular Slide Rule 600 US GOVERNMENT 1960s (DIRTY)
- $67.99 Circular Slide Rule Concise
- $116.00 Very Rare Vintage Original Slide Rule Circular Logarithmic Ruler Ussr
- $46.40 Concise Circular Slide Rule Conversion Tables 1967 CTCS-552 W/Pouch Westinghouse
- $29.99 VINTAGE SYSTEM SYZER CIRCULAR SLIDE RULE - BELL & GOSSETT W/ INSTRUCTION BOOKLET
- $35.00 Circular slide rule KL - 1. Vintage.
- $14.99 Rare Vintage MAC Tools Decimal & Metric Equivalent Circular Slide Rule Chart
- $47.59 CONCISE Circular slide rule Weight calculator Made in Japan NEW
- $95.00 Vintage Rare ARISTO MERCATOR 623 Circular Slide Rule GERMANY
- $31.98 Vintage 24" Circular Slide Rule Durex Plastics Division Wheel Chart READ
- $27.76 CONCISE circular slide rule 27N 100805 Made in Japan NEW
- $39.00 Fullerton Circular Slide Rule by K.K Konsaisu, Acudial Model# 1458, Used
- $44.56 Concise Ruler Circular Slide Rule No.300 100829 110mm JAPAN
- $25.00 Circular slide rule 2 units. For parts.
- $39.00 Concise No 751 Circular Slide Rule English-Metric Converter w/case-instructions
- $25.00 Vtg 3 Pc Japan Concise Circular Slide Rule No 28N Micro Switch Honeywell Advert
- $23.00 Cutler Hammer Circular Slide Rule
- $62.00 Deitzgen Circular BINARY SLIDE RULE with Case and Instructions USA (C) 1931, 40
- $47.59 CONCISE Circular slide rule 480 Made in Japan NEW
- $22.00 Concise circular slide rule Japan no 260. With Case And Manual
- $24.99 Leonard Construction Sama & Etani Circular Slide Rule with Plastic Sleeve
- $89.99 CONRAY Radiological Tables and Circular Slide Rule - Concise (Sama & Etani)
- $39.99 Fullerton Circular Slide Rule by K.K Konsaisu, Acudial Model# 1458, Used
- $54.99 Scientific Instruments Co No. 250 Professional Circular Slide Rule 1962 in Box
- $65.00 Binary 8-in Diameter CIRCULAR SLIDE RULE with Leatherette Cover Lietz
- $55.00 Controller model 75R circular metal slide rule, excellent, with case.
- $200.00 Vintage FXR Radio Transmission Line Calculator Smith Chart & Circular Slide Rule
- $140.00 Vintage Gilson Circular Midget Slide Rule Copyright 1919 Patent 1922 USA MADE
- $15.00 Fullerton Circular Slide Rule by K.K Konsaisu - Japan - 3.5” Acudial No. 1458
- $17.95 Vtg Bell & Gossett System Syzer Circular Rotary Slide Rule Calculator (A4)
- $26.00 Japan Fullerton Circular Slide Rule No. 1450 w/Case & Manual ~ great condition!
- $29.90 SYNPRO Sama & Etani Circular Slide Rule with Case & Instructions
- $59.00 Engineer Logarithmic Mathematical Circular Slide Rule KL-1 Calculator USSR
- $149.00 Vintage Scientific Instruments Co (SIC) Professional Circular Slide Rule No 120
- $35.99 CONCISE Vtg MADE IN JAPAN Drafting/Engineer's No. 270 Circular SLIDE RULE w/Case
- $39.44 CONCISE circular slide rule NO.270N Made in Japan NEW
- $110.00 Vintage Pickett Dial Rule Circular Slide Rule 101-C in Case with Manual 1957
- $12.00 Small Collection Of 3 Vintage Circular Slide Rules / Calculators, Sinclair, Etc.
- $39.99 Vtg Nupro Valves Sama Etani 600 Concise Science Circular Slide Rule
- $19.99 VINTAGE 1960s REGAL SMALL APPLIANCE PROFIT FINDER! CIRCULAR SLIDE RULE! 4" DIA!
- $46.76 Concise Ruler Circular Slide Rule No. 300 100829 Made IN JAPAN 110mm
- $39.99 Vintage Concise No. 300 Circular Slide Rule + w/ Case & Manual – CE Lummus NJ
- $46.74 Vtg Concise Circular Slide Rule No. 28 Sealed Package Herald Electronics JAPAN
- $39.99 Hoskins Thermocouple-Temperature Computer - Circular Slide Rule - Chromel Alumel
- $60.13 Concise Ruler Circular Slide Rule Stadia 100850 Dedicated Storage Case Included
- $39.00 VTG 1960 MODEL CTCS-552 CONCISE CIRCULAR SLIDE RULE & CONVERSION TABLES & MANUAL
- $42.50 CONCISE Circular Slide Rule, NORPLEX
- $25.38 CONCISE Circular slide rule NO.28N (English Ver.) Made in Japan NEW
- $47.91 CONCISE Circular slide rule Stadia Made in Japan NEW
- $85.00 1966 CONRAY Radiological Tables & Circular Slide Rule - Mallinckrodt St Louis MO
- $25.79 CONCISE Circular slide rule 28N (English Ver.) 100973 Made in Japan NEW
- $7.99 1950s DuPONT Auto Painting JOB ESTIMATOR circular slide rule Slide Chart—profits
- $52.00 Sama & Etani Circular Slide Rule # 600-ST Made By Concise - Japan, w/ Sci Tables
- $15.95 1959 General Industrial Co. Circular Slide Rule Chicago, Illinois
- $45.00 Vintage PAN AM AIRLINES Concise Circular #28 Slide Rule - Pan American Airways
- $39.99 Vtg 1968 Sawa & Etani Concise Circular Slide Rule Model 600 B F Goodrich Advert
- $24.85 Concise Circular Slide Rule No 28 With Case Measurement Conversions Gates Japan
- $39.72 Concise Ruler Circular Slide Rule 28N 100973 Dedicated Storage Case Included
- $49.92 Concise Ruler Circular Slide Rule Days 480 Diameter 105mm 100836 F/S w/Track#
- $32.00 Sanderson Flight Computer SC -3B w Manual & Case
- $27.76 CONCISE Circular slide rule 28N (English Ver.) Made in Japan NEW
- $15.99 Vintage Sears Calorie Counter - Perrygraf 1967 Semi Circular Slide Rule
- $12.75 Agathon Alloy Steels Circular Slide Rule Chart - Whitehead & Hoag
- $49.57 CONCISE Circular slide rule No.300 Made in Japan NEW
- $28.00 Concise No. 28N CIRCULAR SLIDE RULE & Sheath Case - Dex-O-Tex - Crossfield JAPAN
- $56.17 CONCISE Circular slide rule Machine tool 100867 Made in Japan NEW
- $49.99 VINTAGE CONCISE CIRCULAR SLIDE RULE NO 320 CS 204 W/CASE & INSTRUCTIONS
- $9.95 Vintage - Calculator Slide Rule - American Beauty Spaghetti -1961 - Blue
- $19.99 Vintage Dubilier Capacitors Power Factor Calculator Circular Slide Rule
- $119.99 Procentor Circular Slide Rule West Germany Vintage
- $6.85 Vintage: MILE-DIAL Gasoline Mileage Calculator Circular Slide Rule - TEXGAS.
- $398.00 PICKETT CIRCULAR SLIDE RULE & LEATHER CASE Model 110 ES
- $103.50 Logarithmic Ruler KL-1 Circular Slide Rule 1966 Calculator Vintage USSR Soviet
- $636.99 1957 CONVAIR F-102A DELTA DAGGER PERFORMANCE CIRCULAR SLIDE RULE! CONFIDENTIAL!