Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MARGUERITE-HENRIETTE BOUCHER
Original Assignee
MARGUERITE-HENRIETTE BOUCHER
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Filing date
Publication date
Application filed by MARGUERITE-HENRIETTE BOUCHERfiledCriticalMARGUERITE-HENRIETTE BOUCHER
Application grantedgrantedCritical
Publication of FR444698ApublicationCriticalpatent/FR444698A/fr
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
G03B9/00—Exposure-making shutters; Diaphragms
G03B9/58—Means for varying duration of "open" period of shutter
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR444698D1912-06-061912-06-06Perfectionnements aux obturateurs pour appareils photographiques
ExpiredFR444698A
(fr)