back-up - beam element
- back-up
- back-up light
- back-up lights
- back-up ring
- back-up roll bearer
- backbone frame
- backfall
- backfire
- backfire bypass valve
- backfire limit
- backflash
- background noise
- backing
- backing block
- backing brake plate
- backing lamp
- backing off
- backing out
- backing plate
- backing ring
- backing run
- backing-up screw
- backlash
- backlash adjuster
- backlight
- backlog of unfilled orders
- backplate
- backpressure
- backpressure reaction
- backrest
- backrest adjuster
- backrest adjustment
- backrest angle
- backrest-adjustable seat
- backstop
- backup alarm
- backup audio alarm
- backup lamp
- backup mode
- backup ring
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