Item description for vintage AMERICAN BLOWER plastic QUICK-DRAFTING TEMPLATES reduce labor for plans

vintage AMERICAN BLOWER plastic QUICK-DRAFTING TEMPLATES reduce labor for plans
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This listing is for the early set of 14 semi-translucent plastic templates with the largest one measuring approx 8.5"x11" and getting smaller from there. There is also the explanation sheet and and a solid plastic white sheet from the Penn Ventilator Company. These things are kept in a pocketed folder.

Quick-Drafting Templates
American Blower
Air Conditioning, Heating and Ventilating Units

to help you reduce labor, increase accuracy in providing detailed plans for system layouts... specify American Blower ... to insure successful layouts from drawing board to installation and service. Undated, maybe 1950??? only guessing.
CONDITION: See listing description and photos.

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LOC:
LOC2: BOOKBOX23-IN.SLEEVE-TMK