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educational
electrical
electroboom
electronics
engineering
entertainment
equipment
mehdi
mehdi sadaghdar
arc
mishap
physics
sadaghdar
science
test
tools
circuit
funny
learn
shock
spark
land line
home phone
telephone
tip and ring
phone line
wiretap
conversation
audio
recording
intercept
listen
ringing
switching center
Uploaded by: Balázs Szabó
Views: 16.040