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http://www.google.com/patents/US653936?utm_source=gb-gplus-share
Patent US653936 - WTTBTIM X X X
WTTBTIM X X X
DONALD MURRAY
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Patent number
: 653936
Filing date
: Feb 27, 1900
Issue date
: Jul 17, 1900
Inventor
:
DONALD MURRAY
Original Assignee
:
THE POSTAL TELE
Current U.S. Classification
:
178/16
;
83/234
;
83/575
;
178/4
;
335/92
View patent at USPTO
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