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| View Original: | Forstner bit Patent CA23548.png (1819x2572) | |||
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| Keywords: Forstner bit Patent CA23548.png en Page of patent patent CA23548 de Seite des Patents CA23548 https //worldwide espacenet com/publicationDetails/originalDocument CC CA NR 23548A KC A FT D ND date 18860306 DB locale en_EP Benjamin Forstner 1886-03-06 PD-old-auto 1897 Patents Forstner bits 1886 works | ||||
