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US Patent: 549,449
Apparatus for indicating difference of phase
Patentee:
Michael von Dolivo-Dobrowolsky (exact or similar names) - Berlin, Germany

USPTO Classifications:
307/102, 307/84, 322/20, 322/80, 324/90

Tool Categories:
electrical devices

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Karl Wilkens
Anton Weber
Patent Dates:
Applied: Apr. 20, 1895
Granted: Nov. 05, 1895

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Description:
US equivalent of British patent GB-189,223,113 and German patent DE-69,159.

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