| http://www.w3.org/ns/prov#value | - In this case where the air permeable member 10 can be turned with ease by using a tool such as a screw driver or a coin with its edge placed in the cross groove 12 provided in the lug portion 10b of the air permeable member 10, the bosses 15, disengaged from the grooves 23, may switch over to engage with the grooved portions 22.
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