filament cathode (=filament-type cathode =filamentary cathode)
hot-cathode valve hot-cathode tube
box coupling (muff- coupling)
capacitive coupling {electrostatic coupling}
close coupling [= tight coupling]
cone(type)coupling taper coupling
coupling shaft coupling
elastic coupling flexible coupling
Hooks coupling universal coupling
(pool-cathode) mercury arc rectifier
304 Stainless Steel Cathode Plate
activated carbon cathode
Activated carbon fiber cathode