Technical supply co., Scranton. [from old catalog] · Scranton, Pa., Technical supply co · leaf 53
TECHNICAL SUPPLY COMPANY SCRANTON, PA. … cleaning- of the pen, throw out the release lever on the upper blade—withoutaltering the setscrew—clean the pen, press both blades together and returnthe release lever to its original position. Thus the pen is easily kept cleanand its durability increased, and the draftsman will lose no time in…
Engineering instruments · Drawing instruments
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