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http://www.google.com/patents/US1644239?utm_source=gb-gplus-share
Patent US1644239 - -APPARATUS FOR PRODUCING SERIES OP SIGNS
-APPARATUS FOR PRODUCING SERIES OP SIGNS
A. G. DAMM et al
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Abstract
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Description
Claims
Patent number
: 1644239
Filing date
: Sep 25, 1924
Issue date
: Oct 4, 1927
Inventors
:
A. G. DAMM
,
A. G. DAMM
Current U.S. Classification
:
380/58
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Referenced by
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Issue date
Original Assignee
Title
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US6130946
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