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US Patent: 557,246
Photographic Exposure Meter
Patentee:
George Frederick Wynne - Minera, Denbigh County, Wales, England

USPTO Classifications:
235/64.7, 235/69, 235/83, 396/295

Tool Categories:
specialty tools : slide rules : special purpose slide rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jan. 25, 1894
Granted: Mar. 31, 1896

Patent Pictures:
USPTO pdf tiff
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