| 摘要 |
A housing configured to accommodate a tire monitoring unit may include an extended portion, extending along a circumference of a wheel rim, and a pair of engaging members provided in parallel with the extended portion at opposite lateral sides thereof. A holder may be provided that is configured to accommodate the housing therein and to be secured to the wheel rim. The holder may include an open end portion, configured to receive therein the housing, and a holding portion configured to hold the extended portion. Also, the holder may include at least a pair of engaging portions provided in parallel with the holding portion at opposite lateral sides thereof and configured to engage with the engaging members, so that when the housing is inserted into the holder through the open end portion, with the extended portion being held in the holding portion, the engaging members are engaged with the engaging portions.
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