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http://www.google.com.au/patents/US773669?utm_source=gb-gplus-share
Patent US773669 - PERPETUAL CALENDAR
PERPETUAL CALENDAR
THOMAS O SHAUGHNESSY et al
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Patent number
: 773669
Filing date
: 5 May 1904
Issue date
: 1 Nov 1904
Inventors
:
THOMAS O SHAUGHNESSY
,
THOMAS O SHAUGHNESSY
Current U.S. Classification
:
283/2
View patent at USPTO
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Referenced by
Citing Patent
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Issue date
Original Assignee
Title
US4319771
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US4472893
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25 Sep 1984
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US4813707
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21 Mar 1989
Perpetual calendar
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