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US Patent: 3,451,142
Teaching Machine
Patentee:
Raymond H. Hartjen (exact or similar names) - Rochester, Monroe County, NY

USPTO Classifications:
271/119, 434/349

Tool Categories:
photographic apparatus : audio-visual apparatus

Assignees:
Graflex, Inc. - Rochester, Monroe County, NY

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Mar. 13, 1961
Granted: Jun. 24, 1969

Patent Pictures:
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