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US Patent: 4,699X
Machine for cutting metallic and other hard surfaces
John H. Hall - Harpers Ferry, VA

USPTO Classifications:

Tool Categories:
metalworking machines


Not known to have been produced


Patent Dates:
Granted: Mar. 07, 1827

Patent Pictures:
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Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.

During his two decades at Harpers Ferry, Hall developed and constructed drop-hammers, stock-making machines, balanced pulleys, drilling machines, and special machines for straight-cutting, lever-cutting, and curve-cutting. Hall's straight-cutting machine was the forerunner of today's versatile milling machine, and a critical tool used in the fabrication of precision metal firearm components.

John Hall was credited for inventing the Milling Machine to speed up production of rifles at the Harpers Ferry Arsenal. This patent may have been for that original Milling Machine.

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