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.)
SENTRY SAFETY CONTROL CORP
Original Assignee
SENTRY SAFETY CONTROL CORP
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Filing date
Publication date
Application filed by SENTRY SAFETY CONTROL CORPfiledCriticalSENTRY SAFETY CONTROL CORP
Application grantedgrantedCritical
Publication of FR637903ApublicationCriticalpatent/FR637903A/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
G03B21/00—Projectors or projection-type viewers; Accessories therefor
G03B21/14—Details
G03B21/18—Fire preventing or extinguishing
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR637903D1927-07-191927-07-19Dispositif de protection contre l'incendie pour appareils de projection cinématographiques
ExpiredFR637903A
(fr)