Technical supply co., Scranton. [from old catalog] · Scranton, Pa., Technical supply co · leaf 33
i^ THE *TEC^ VACUUM SUN FRAME … For obtaining the closest contact these frames of our own special manu-facture are unsurpassed. B}^ means of a hand pump, the air is entirely exhausted between thecushion and the glass, forming the best contact obtainable between thetracing and sensitized paper. By the use of the Tec Vacuum Sun…
Engineering instruments · Drawing instruments
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