Technical supply co., Scranton. [from old catalog] · Scranton, Pa., Technical supply co · leaf 213
(% il TEC DRAWING BOARDS—Continued … 2210 2210. Drawing Board, pine wood, with hardwood ledges, bolted into theboard to allow contraction and expansion, and grooves sunk inone-fourth the thickness of the board, thus allowing the narroww^ooden strips to be still more effectually controlled by the hardwoodledges. Size, in Inches, 31/42…
Engineering instruments · Drawing instruments
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