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    Aristo Martin Space Rule 1962 (model 80123) owned by Donald Kent (Deke)Slayton, an American World War II pilot, one of the original NASA Mercury Seven astronauts and a NASA administrator.

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    20" Mannheim Polyphase mahogany rule owned by Naval Intelligence officer Joseph Daniel Coker in the planning of the Greenbrier Bunker in West Virginia for the US government for nuclear attack.

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    Pickett N4 (10" Desk, 34 Scales) and N600 (5" Vest, 22 Scales) Twin Pack for Desk & Vest

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    Pickett N4 (10" Desk, 34 Scales) and N600 (5" Vest, 22 Scales) Twin Pack for Desk & Vest

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    Pickett Circular Slide Rule (Model 101c) All Metal Circular Dial Rule

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    Denny-Reyburn Rotary Slide Rule (Model 39001)

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    Keuffel & Esser Duplex Decitrig Slide Rule (Model 68-1210) 10” Mahogany, 22 Scales

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    Keuffel & Esser Lifetime Guarantee

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    Keuffel & Esser Duplex Decitrig (Model 68-1210) 10” mahogany, 22 Scales

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    Aristo 4" white plastic construction with conventional inch rule with Leather Case

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    Aristo 4" white plastic construction with conventional inch rule

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    Post 10” Mahogany white face with 6 scales (one sided rule)

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    Pickett N3p-ES Synchrolog 5" all metal, 32 scale selections with 80" log/log range LN scale puts logarithms and exponents to base e directly into combined operations (eye-saver yellow)

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    Pickett N3p-ES Synchrolog 5" all metal, 32 scale selections with 80" log/log range

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    Pickett N4 Vectorlog 10" All-Metal, 34 Scales with 20" Square Root Scales

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    Pickett N4 Vectorlog 10" All-Metal, 34 Scales with 20" Square Root Scales

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    Keuffel & Esser Duplex Decitrig (Model 68-1210) 10” Mahogany, log log rule with 22 scales

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    Keuffel & Esser Duplex Decitrig (Model 68-1210) 10” Mahogany, log log rule with 22 scales

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    Keuffel & Esser Duplex Decitrig (Model 68-1210) 10” Mahogany, log log rule with 22 scales Leather Case & Original Hard Bound Instructions Manual

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    Keuffel & Esser Duplex Decitrig (Model 68-1210) 10” Mahogany, log log rule with 22 scales

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    Keuffel & Esser Duplex Decitrig (Model 68-1210) Original Hard Bound Instructions Manual

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    Keuffel & Esser Slide Rule Care Guide

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    Keuffel & Esser Jet-Log (Model 68 1251) 10” log/log rule, 22 scales White Plastic Construction, Leather Case & Original Hard Bound Manual

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    Keuffel & Esser Jet-Log (Model 68 1251) 10” log/log rule, 22 scales White Plastic Construction, Leather Case & Original Hard Bound Manual

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    Keuffel & Esser Original Pocket Slide Rule Promotion

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    Keuffel & Esser Jet-Log (Model 68 1251) 10” log/log rule, 22 scales

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    Pickett (Bl Powerlog) 10” Advanced 25 Scale Bamboo Rule with 60 inch log/log range
    Interacting A & B scales, 20" of Extended Math, Trig, and Root Scales.

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    Pickett (Bl Powerlog) 10” Advanced 25 Scale Bamboo Rule with 60 inch log/log range
    Interacting A & B scales, 20" of Extended Math, Trig, and Root Scales.

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    Pickett (Bl Powerlog) 10” Advanced 25 Scale Bamboo Rule with 60 inch log/log range
    Interacting A & B scales, 20" of Extended Math, Trig, and Root Scales.

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    Keuffel & Esser (Deci-lon) 5” white plastic construction rule.

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    Keuffel & Esser (Deci-lon) 5” white plastic construction rule.

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    4” wooden slide rule made in England

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    Keuffel & Esser (model 4183) Tan Belt Carriers for K&E Slide Rule Cases

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    Pickett Slide Rule from Oilfield Company REDA Pump Co.

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    Bell Helicopter Company Pickett 5” plastic rule (white), 7 scales (single sided rule)

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    Keuffel & Esser 10" White Plastic Slide Rule with Leather Case

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    Keuffel & Esser 10" White Plastic Slide Rule (model 4161-3)

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    Pickett Student Slide Rule (Model N 3P-ES) 5” all metal construction log log dual base
    Eye-Saver Yellow with Original Instruction Manual