Levers are simple machines consisting of a rigid bar that pivots about a fulcrum; used to transmit and enhance power or motion.
Knobs are projecting components that are attached to a latch, handle or linkage which helps facilitate the operation of the hardware.
Handles are a part of, or attachment to, an object that can be moved or used by hand. The design of each type of handle can involve substantial ergonomic issues.
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