Abstract: A tennis ball marker which has no moving parts in operation and in which a plurality of removable and interchangeable heating imprint modules are mounted in a housing containing an electric circuit for controlling the supply of power from a source to heat the imprint modules. The imprint modules comprise a ceramic body having an electric heating element embedded therein. The top surface of the ceramic body provides raised portions in the shape of letters or other identifying indicia which are seared onto the surface of a tennis ball placed in contact therewith. The imprint modules are readily interchangeable and are removably plugged into electrical receptacles in the housing to permit the identifying indicia to be readily changed. The housing includes window means through which the imprint modules are exposed.

Abstract: A combined tennis racket cover and support press including a case made of stiff material such as plastic and adapted to receive a tennis racket head, which case includes a bottom frame portion hingedly connected to two top half-frame portions which may be opened to receive the head of a tennis racket and closed and locked against springs urging open the top half-frame portions. The case provides a stiff enclosure to protect the racket against physical damage and contains pressure pads for applying pressure onto the head of the racket to prevent warpage.