Abstract: An electric hair clipper comprising a first clipper body having a support tongue pivotally mounted on an inclined front end of the clipper body, the support tongue having an upper surface carrying a first projection and a top end defining a second open-ended slot; a first cutting head assembly releasably and operably engageable with the first clipper body, the first cutting head assembly having a tongue-receiving socket, for releasably receiving the support tongue, comprising a strap disposed on a bottom blade of the cutting head assembly, the strap having a central portion with a bottom end defining a first open-ended slot and an inner surface carrying a second projection wherein the first and second projections are received in the first and second slots, respectively, when the support tongue is inserted into the tongue-receiving socket to releasably and operably engage the first cutting head assembly with the first clipper body and also to prevent the first clipper body and the first cutting head assembly f