Vintage 1974 Army ROTC Metric Conversion Slide Chart

Vintage 1974 Penn State PSU Memorabilia Army ROTC Conversion Slide Rule - 70s

Vintage 1974 US Metric Converter Slide Ruler Conversion Chart - USA Army Guard

1974 Perrygraf 3M METRIC MASTER Calculator Slide Rule Conversion Chart

VTG 1974 US Metric Converter Slide Ruler Conversion Chart US Army National Guard

Vintage 1979 Metric Converter Slide Rule Chart Learning Research Inc. Woodbury