機器
aged
alphabet
ancient
antiquated
antique
background
busy
call
code
communicate
communication
connecting
connection
conversation
device
electrical
equipment
global
help
historical
history
isolated
key
message
morse
number
object
obsolete
old
phone
retro
send
signal
sos
technology
telecommunications
telegram
telegraph
telegraphic
telephone
transceiver
transmit
used
vintage
wave
white
wireless
wood
wooden