$25

vintage Slide Rule: SANS & STREIFFE # 311 With Case

$15

K&E No. 4081 Slide Rule Manual Log Log Duplex Decitrig No. 68 2047

$14.99

Vintage Lawrence Engineering Ser. [10B] Wooden Slide Rule (Peru, Indiana) w/ Box

$30

VINTAGE 1962 PICKET & ECKEL HI-LOG Speed Rule & ORIGINAL CASE MODEL N-500-ES

$9.95

Vintage AIRCO Aircomatic Welding Selector Slide Guide Lot Of 6 Including Cover

$24.99

Vintage Dietzgen #1757 Slide Rule, Case with Case USA Made ~ Primatrig

$25

FREDERICK POST WOOD SLIDE RULE NO. 1447 And Vintage Wood Ruler (C9)

$19.99

VTG BEAM SPAN COMPUTER Calculator Paper Slide Rule Structural Engineering USA

$227.7

Hemmi No. 269 'Civil Engineer' Slide Rule. Duplex. Bamboo. 25 Scales. NEW JPN

$40

1962 Vintage Pickett Model N-500-T Metal Slide Rule with Leather Case

$12.95

Vintage Wood, Lawrence Engineering Service Slide Ruler, Wabash Indiana

$7.99

Logansport Metal Culvert Co. In. Drainage Table Formed Bottom Structures Chart