| 摘要 |
A projection is formed on the upper edge of the side wall of a front cabinet, a depression is formed on the upper edge of the side wall of a front cover, and a protrusion is formed on the upper edge of the side wall of a rear cabinet. The front cabinet is supported between the front cover and the rear cabinet, such that the projection of the front cabinet is pressed against the depression of the front cover by the protrusion of the rear cabinet and the upper edge of the side wall thereof, and the projection of the front cabinet is locked by the depression of the front cover.
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