Electromechanical

Relays
cables,coaxial
cables low/high power
wire,copper
wire,magnet(isolated copper)
tube,copper
tube,brass
copper foil/sheet
heatsinks
isolating material
ic sockets
Plastic boxes
Metal boxes/chassis
RFI/Shielding
Switches,chassis
Switches,key
Switches,slide
Switches,rotary,pcb/chassis
Switches,rotary encoder
Switches,power
Switches with EMI Filter
Couplers,directional/bidirectional
Fuses
Fuses,resettable