英文關鍵字
assembly
bell
box
cable
communication
communicative
connecting
contact
control
distribution
doorbell
electronics
entrance
entry
entryphone
equipment
fiber
hand
home
house
inner
inter
intercom
interline
internal
interphone
modern
mount
nobody
open
optical
order
outdoors
packaging
phone
pick
protection
push
ring
safety
security
several
system
technology
telecommunication
terminal
tilt
urban
wire