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Burglar alarm bell box Stock Photos and Images
RFC6BF63–Burglar alarm bell box, exterior bell box with strobe cut out. View from the front. Close up (macro)
RFGA4X61–Outdoor Alarm Siren with Strobe or Siren Alarm Bell, 3D rendering isolated on white background
RFMWJ5J6–Isolated view of a residential Alarm and warning strobe seen fitted to the outside of a bricked house in the UK capital.
RFGA4X62–Security surveillance camera with outdoor alarm siren , 3D rendering isolated on white background
RM2CNCT70–. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . t controlling point 1 on the annunciator whicli causes --a A > r.2. r^ B © P® P(o) Fijj:. 17. the arrow to l)e turned and at the same time the bell rincrs. Afterthe attendant has noted the signal, the arrow is restored to itsnormal position by pressing a lever on the bottom of the annun-ciator box. The electric burglar alarm furnishes a very efficient protec-tion and is an application of the principles already
RF2C9K7MA–School Alarm icon vector, filled flat sign, solid pictogram isolated on white, logo illustration. School Alarm icon for presentation.
RM2CRWCHF–. Bell telephone magazine . each subscribers station was a two-point switch, bymeans of which his line could be connected to either his sub-station burglar alarm circuit or to his box telephone, as desired.For telephone operation, during the daytime, the bank vaultor safe at the subscribers premises was short-circuited, thisshort circuit being removed at night, when the burglar alarmsystem was in operation. As will be seen from Figure 3, the system operated on a nor-mally closed circuit, from ground at the substations, throughthe central office galvanometers, G-b, G-d, etc., battery B-2and gro
Search Results for Burglar alarm bell box Stock Photos and Images (60)
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