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Arithmometre
L.E. Jones
Slide Rule
L.E. Jones
Aristo Table
L.E. Jones
Abacus
L.E. Jones
The Principles and Practice of the Chinese Abacus by Lau Chung
L.E. Jones
Mannheim Type Slide Rule
L.E. Jones
UNIS Marc Slide Rule made for The Dominion Bridge Company, Limi
L.E. Jones
Picket Log-Log Speed Rule (Dual Base): Model N 600-ES
L.E. Jones
The Supreme Slide Rule
L.E. Jones
Pickett Ortho-Phase Duplex Slide Rule. Model Number 1000
L.E. Jones
Pickett Microline 140-ES Duplex, Log Log Slide Rule
L.E. Jones
The "Master Wheel"
L.E. Jones
Aristo-Studio Nr.0968 Slide Rule
L.E. Jones
Diwa Denmark No.914 Slide Rule
L.E. Jones
Deci-Multiphase Log Log Slide Rule: Model 3
L.E. Jones
Slide Rule for Specific Speed of Hydraulic Turbines
L.E. Jones
Fuller's Spiral Slide Rule
L.E. Jones
Mechanical Calculator
L.E. Jones
Decitrig Duplex Slide Rule
L.E. Jones
Triangular Ruler
L.E. Jones
Tate Arithmometer
L.E. Jones
Aristo Clip on Supports (for a side rule stand)
L.E. Jones
Slide Rule for Triangle-mesh-reinforced Concrete Slabs
L.E. Jones
While and Gillespie Ruler, Model No. WG/P1
L.E. Jones
Charvoz-Roos Duplex Slide Rule: Model SR-109
L.E. Jones
Pickett Log Log Slide Rule: Model 800
L.E. Jones
Japanese Abacus
L.E. Jones
Log-Log Duplex Slide Rule: Janus Series Dual Face Blundell T50
L.E. Jones
Alco Personal Calculator or Alco Four-Rule Personal Calculator
L.E. Jones
Lawrence Engineering Service 10-B Slide Rule
L.E. Jones
Log-Log Duplex Slide Rule: Janus Series Dual Face Blundell T50
L.E. Jones
Polyphase Duplex Slide Rule: Model N4088S
L.E. Jones
Universal Valve Sizing Rule
L.E. Jones
Polyphase Duplex Slide Rule
L.E. Jones
Curta Type I Calculator
L.E. Jones
Ruler
L.E. Jones
2 Star Quality Triangular Rulers
L.E. Jones
Thatcher's Calculating Instrument
L.E. Jones
Japanese Abacus
L.E. Jones
Dodge Calculator
L.E. Jones
Aristo Rietz Slide Rule: Model Nr. 89
L.E. Jones
Pickett Trig Slide Rule: Model 1010
L.E. Jones
Pickett Ortho-phase Log Log Slide Rule. Model number 500
L.E. Jones
Pickett Deci Log Log Slide Rule. Model Number 2.
L.E. Jones
Albert Nestler No. 41 Slide Rule
L.E. Jones
Nestler 11-ZR - Closed Simplex Slide Rule
L.E. Jones
The Ever There Slide Rule- Casing and Manual Only
L.E. Jones
Dual Base Log/Log Exponential Speed Rule: Model N4-ES
L.E. Jones
Mannheim Slide Rule: Model K & E, 4051
L.E. Jones
Graphical Site Table Slide Rule
L.E. Jones
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