US Patent: 649,972 - Electric-motor-controlling device


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US Patent: 649,972

Electric-motor-controlling device

Patentee:

Thomas S. Watson (exact or similar names) - Milwaukee, WI

USPTO Classifications:

200/563, 200/8A, 307/101, 318/250, 338/153

Tool Categories:

specialty machines : dental apparatus

Assignees:

Browning Mfg. Co. - Milwaukee, WI

Manufacturer:

Not known to have been produced

Witnesses:

B. C. Roloff

H. G. Underwood

Patent Dates:
Applied:	Oct. 04, 1898
Granted:	May 22, 1900

Patent Pictures:

USPTO (New site tip)
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Description:

"My invention relates to devices for controlling electric motors, having especial reference to those employed in the operation of rotary dental tools..."