Versalog Slide Rule Instructions Frederick Post Company 1951 Manual Book HC Vtg

Vintage Frederick Post Co. No. 1462 Slide Rule Original Leather Case & Box 1945

Fredrick Post Co. 1447 Slide Rule

VERSALOG Slide Rule Instructions, The Frederick Post Co.

Vintage Post 1460 Versalog Fredrick Post Hemmi Japan Slide Rule & Leather Case

Fredrick Post Co. 1447 Bamboo Slide Rule Ruler with Case Japan vintage retro

Fredrick Post Co 1460 Versalog Hemmi Slide Rule, with Leather Case, Ex Condition

Vintage Fredrick POST No. 1445 Chicago Hemmi Slide Rule w Case Tools Japan