Technical supply co., Scranton. [from old catalog] · Scranton, Pa., Technical supply co · leaf 365
4100. Polar Planimeter, German silver, arranged for measurement ofareas in square inches; viz., 10, 1, %o, and Moo square inches,with directions, in case each, $19.00 … 4102. Polar Planimeter, German silver, for every kind of measure-ment, with directions, in case each, $25.00
Engineering instruments · Drawing instruments
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