| 摘要 |
A tape-running display unit for magnetic tape recorder, comprising a rotatable display drum provided with a dark-colored zone and a light-colored zone formed on the cylindrical surface of said drum the zones being defined by a helix and a generatrix, a slitlike window opening for viewing the movement of a part of said helix when said tape and said drum are moved in phase with each other; a selector runner adapted for showing a selected length of travel of said tape; an electrical switch arranged to be controlled by said selector when the tape has travelled the selected length and to control in turn the operation of the tape-reeling mechanism of the tape recorder.
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