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US Patent: 15,862
Caleb C. Walworth - Boston, MA

USPTO Classifications:
269/242, 269/63

Tool Categories:


Not known to have been produced

M. H. Merriam
G. B. Crosby

Patent Dates:
Granted: Oct. 07, 1856

Patent Pictures:
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"The nature of my invention consists in certain devices whereby two vises are so arranged as to revolve about a common center, and which many be locked firmly in any determined position... and which I call a 'compound revolving vise.' The particular use to which I have applied my invention is to hold gas pipe fittings for the purpose of tapping, screwing and boring them."

According to the 1873 "Subject-matter index of patents for inventions issued by the United States Patent Office", this patent was granted an extension.

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