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Patent US617684 - HELIOGRAPH
HELIOGRAPH
JULIEN P. FRIEZ et al
› Overview
Abstract
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Description
Claims
Patent number
: 617684
Filing date
: May 17, 1898
Issue date
: 1899
Inventors
:
JULIEN P. FRIEZ
,
JULIEN P. FRIEZ
Current U.S. Classification
:
74/416
;
116/20
View patent at USPTO
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Referenced by
Citing Patent
Filing date
Issue date
Original Assignee
Title
US5664457
Jun 24, 1994
Sep 9, 1997
Amir Nejati
Screw gear means and method for same
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