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jack boot / jack-boot
calling officer
calling party
Digital Selective Calling (DSC)
calling equipment
calling relay
automatic calling equipment
selective calling system, SELCAL system
calling signal
calling-up paper
Jack-in-the-box effect
leveling jack
jack staff / jackstaff
cart jack
cylinder head jack nut collar
cylinder jack nut
jack
jack and pinion rack
jack knifing
jack lift
jack lift point
jack pad
flap jack
horizontal stabilizer control jack
screw jack
aircraft jack
landing-gear retraction jack
main jack
nose-gear retraction jack
wing jack
patching jack
external speaker jack