vintage 4 small ruler Frederick Post Co. No. 1441 SUN Hemmi Japan

Japan Slide Rule

VTG SUN HEMMI Slide Rule Bamboo No.34Rk Japan & Leater Case

Calculating the Quality of Vintage Slide Rules

Calculating the Quality of Vintage Slide Rules

VINTAGE SLIDE RULER

Frederick Post Co Sun HEMMI Japan Slide Rule No. 1447

Eric's Hemmi Slide Rules

VINTAGE SUN HEMMI Slide Rule No. 34RK w/ Case Tokyo Japan

Eric's Hemmi Slide Rules

Eric's Hemmi Slide Rules

Japan Slide Rule

VINTAGE 1441 POST SUN HEMMI BAMBOO SLIDE RULE OCCUPIED JAPAN

Model: 1446. Type: Slide Ruler. Made in Japan.

Vtg 40s Frederick Post 1446 Sun Hemmi Slide Ruler Made in Japan

FREDERICK POST Slide Rule No 1446 Made In Occupied Japan