| 摘要 |
An erasure preventing thumbwheel is located in the front wall of a cartridge and is rotatable in an opening in the front wall. The thumbwheel has a larger diameter central portion which is exposed through the opening and includes a flat section which corresponds in size and shape to the opening. When the flat section registers with the opening, the tape is write-protected. The thumbwheel has a circumferential ridged gripping portion at one edge of the central portion which extends around the non-flat cylindrical section of the thumbwheel. The gripping portion does not extend along the edge of the flat section.
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