alarm
alert
attention
ball
battery
bell
burglar alarms
called
circuit
clapper
coil
contacts
current
danger
diagram
door bell
doorbells
education
educational
electric
electrical
electricity
electromagnet
electromagnetism
emergency
equipment
field
fire
fire alarms
gong
illustration
iron
loud
magnet
magnetic
metal
old
old telephones
physics
pole
pulling
railroad crossings
ring
safety
school
school bells
science
scientific
security
shape
sound
spring
steel
switch
urgency
urgent
定額
Electric bell. How electric bell works. Electromagnet pulls the clapper. The hammer strikes the gong. In its rest position the clapper is held away from the bell a short distanceの素材 [FY31054492229]
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