lock - main
- lock
- lock bottom
- lock chamber
- lock in gear
- lock joint
- lock nut
- lock oil
- lock out
- lock piece
- lock rod
- lock screw
- lock washer
- lock with a cotter pin
- lock with dowels
- lock-chamber
- lock-on connection
- lock-out
- lock-up position
- locked rope
- locked-coil rope
- locked-up stresses
- locking angle
- locking apparatus
- locking bar
- locking washer
- locknut
- lockout equipment
- lockout fault
- lockout resistance
- lockout resistance to earth
- loco haulage
- locomotive
- locomotive buttery
- locomotive crane
- locomotive for suspended monorail or floor-rails
- locomotive haulage
- locomotive operator
- locomotive transport
- lode
- lode mining
