US Patent: 749,821 - Drilling-machine


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US Patent: 749,821

Drilling-machine

Patentee:

Theodore C. Hansen (exact or similar names) - Chicago, IL

USPTO Classifications:

144/103, 144/135.4, 144/149, 144/93.1, 408/117, 408/128, 451/236

Tool Categories:

trade specific : music instrument maker

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Charles E. Pickard

Julia M. Bristol

Patent Dates:
Applied:	Jul. 26, 1902
Granted:	Jan. 19, 1904

Patent Pictures:

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Description:

"My invention relates to drilling-machines, and particularly to drills adapted to bore a series of sets of holes for the pins on piano-bridges and for similar purposes in which it is desired to bore a number of sets of equidistant holes with two or more holes in each set on the same line with each other and with the sets of holes parallel to each other."