DIRECTIONS For USING SNOW'S GAS REGULATORS FOR DENTAL VULCANIZERS. Patented October 17, October 31, December 19, 1893
Cream paper, black printing
[Buffalo]: [The Snow Dental Company], (n. d.). Circa 1890s. Cream paper, black printing. Two fold lines; light general wear; toning to upper 1/3 of first page. About VG.. Bifolium, 4 unnumbered pages. Two b/w engravings, one of the "Challenge Regulator" and one of the "Index Regulator.". 8-1/2" x 5-1/2" (Inventory #: 42982)
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