| http://www.w3.org/ns/prov#value | - The merits of making the air-permeable seal member 102 and the inside of the counterbore portion 100 cylindrical are that the seal member 102 is not easily wrinkled when it is inserted into the counterbore portion 100, and that a compression amount of the seal member 102 becomes even over the entire circumference because its section is a circle, whereby the toner leakage does not occur.
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