| http://www.w3.org/ns/prov#value | - made at an angle of 180 degrees, the sealing member 322 and the cap 323 are positioned equally, and then, if the light emitting and receiving portions 324 are covered by the cap 323, for example, ink and other particles adhering to the cap are transferred to the light emitting and receiving portions 324, making it difficult to maintain the accuracy of reading.
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