The classification of patents

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110 1 ‡aUnited States. ‡bPatent Office.
245 1 4 ‡aThe classification of patents.
260 ‡aWashington, ‡bGovt. print. off., ‡c1915.
300 ‡avi, 40 p. ‡c23 cm.
500 ‡aAt head of title: United States Patent office.
538 ‡aMode of access: Internet.
650 0 ‡aPatents ‡zUnited States.
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DAT 1 ‡a20181128123459.0 ‡b2018-12-11T19:08:46Z
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