Abstract: A tape cassette for use in a tape printer having a sensor. The tape cassette includes a cassette case with an accommodation space, an exchangeable tape unit having a tape spool and a print tape wound around the tape spool. The exchangeable tape unit is removably receivable in the accommodation space of the cassette case. A tape differentiation member includes a tape spool support and a tape specifier wherein the tape spool support engages with the tape spool so that the tape spool is freely rotatable thereon. The tape specifier specifies a variety of print tape wound around the tape spool by cooperation with the sensor of the tape printer. The tape differentiation member is provided with the tape unit so that the tape differentiation member is exchanged when the tape unit is exchanged.

Abstract: In a tape holding case including two or three tapes in wound states and at least one of tapes is arranged to be fed out and the other of tapes is arranged to be taken up in the case, a visually distinguishable portion is provided at a trailing end of the tape to be fed out. The distinguishable portion is fed out before the other of tapes is completely taken up within the tape holding case.Thus, the one of tapes is not travelled without taking up operation of the other of tapes if an operator ceases the feeding operation after confirming the fed out predetermined portion.

Abstract: An electric data switch, e.g., a rotary switch, that selects data by moving contact portion along tracks of electrodes, in which a contact portion touches two or more electrodes simultaneously, and in which leads between terminals of the electrodes are arranged to avoid touching with the contact portion. This simplifies the switch, allowing it to be smaller and more durable.