Engineering: three-quarter views of two drilling machines, one with multiple heads. Engraving, c.1861.
Wellcome Collection

Engineering: three-quarter views of two drilling machines, one with multiple heads. Engraving, c.1861.

1861

CC0 — Public Domain
Wellcome Collection

Lettering: Drilling machines. Fig. 1.-Shanks' patent double-acting mortice and groove drilling machine. Fig. 2.-Shanks' drilling machine.

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