Same as Type a, but has additional lip for dustproof, can be applied in dust environment.
与A型相同，但增加刮尘唇，可应用于多粉尘环境。
Same as type l, but has additional lip for dustproof, can be applied in heavy dust environment.
与L型相同，但增加刮尘唇，可应用于多粉尘环境。
Same as type l, but has additional lip for dustproof, can be applied in heavy dust environment.
与L型相同，但增加刮尘唇，可应用于多粉尘环境。
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