A door handle spring assembly
A door lock and operation mechanism
A door opener
A door opener unit with a novel pivot latch
A door skin, method of manufacturing a door produced...
A door slab assemble structure for the partly hollow door...
A door strike
A door strike
A door strike having a kicker and an adjustable dead latch...
A door system for a mine stopping
A down-the hole hammer
A downhole activation tool using reacting hydrogen peroxide
A downhole actuator including a sealing bellows
A downhole assembly
A downhole bearing assembly
A downhole bearing assembly
A downhole device
A downhole drift indicator
A downhole modulator apparatus
A downhole positioning system