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)
Non-Portable Lighting Devices Or Systems Thereof
(AREA)
Tendeur de courroie a securite integree contre la rupture et la detente de la courroie, et appareil de radiologie equipe d'un tel tendeur de courroie
Dispositif de retenue en position armee d'une vanne de securite a desarmement manuel, electrique ou automatique par fusion d'un fusible poussant ou tirant situe a l'interieur ou a l'exterieur de la conduite protegee