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Patent US1939215 - PHOTO-ELECTRIC KEYING HEAD
PHOTO-ELECTRIC KEYING HEAD
Frank Kunc
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Abstract
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Description
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Patent number
: 1939215
Filing date
: May 24, 1933
Issue date
: Dec 12, 1933
Inventor
:
Frank Kunc
Original Assignee
:
H
Current U.S. Classification
:
178/17.00D
;
178/17.00R
;
235/458
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