Vintage 1975 Kelsey Hayes Co. KH Promo Metric Master Conversion Slide Rule

Vintage Kelsey Hayes Co. Promo Metric Master Conversion Slide Chart from 1975

Vtg 1975 METRIC MASTER Engineering Calculator Slide Rule from Perrygraf w Sleeve

Vintage Metric Master Promo Metric Conversion Slide Rule Chart

RADIO SHACK METRIC CONVERTER SLIDE RULE #68-1031 TANDY CORP. VINTAGE 1975

PerryGraf Metric Master Converter Slide Rule VINTAGE Kelsey Hayes

1975 PerryGraf Metric Master Converter Slide Rule Chemrite Corp 213-757-8203

1974 Perrygraf 3M METRIC MASTER Calculator Slide Rule Conversion Chart