Electric hair cutting apparatus

Hair cutting apparatus comprising casing structure, drive structure in said casing structure, circuitry connected to said drive structure, shearing head structure coupled to said drive structure, said shearing head structure having a forward edge, spaced comb structure adapted to be seated on said shearing head structure for sliding contact with the skin surface to be treated and adjustable relative to said forward edge of said shearing head structure, sliding switch structure coupled to said circuitry for enabling and disabling said drive structure and having "On" "Off" positions and further positions in addition to said "On" and "Off" positions, said spacer comb structure and said sliding switch structure being provided with engageable coupling means for causing said spacer comb structure to move with said sliding switch structure, adjustable preselector slide structure movable between a plurality of positions, and cooperating contact structure on said preselector slide structure and said sliding switch structure and connected to said circuitry such that said drive structure is not energized until said sliding switch structure is in a predetermined position as determined by the position of said preselector slide structure.