Manual of classification of subjects of invention of the United States Patent office. Rev. to January 1, 1920 (including classification bulletin no. 43)

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110	1	⊔	‡aUnited States. ‡bPatent Office.
245	1	0	‡aManual of classification of subjects of invention of the United States Patent office. ‡bRev. to January 1, 1920 (including classification bulletin no. 43)
260	⊔	⊔	‡aWashington, ‡bGovt. print. off., ‡c1920.
300	⊔	⊔	‡a298 p. ‡c27 cm.
538	⊔	⊔	‡aMode of access: Internet.
650	⊔	0	‡aPatents ‡zUnited States
655	⊔	7	‡aClassification ‡2fast ‡0(OCoLC)fst01697073
710	1	2	‡aUnited States. ‡bPatent Office. ‡tClassification bulletin of the United States Patent Office from ... ‡nNo. 43.
776	0	8	‡iOnline version: ‡aUnited States. Patent Office. ‡tManual of classification of subjects of invention of the United States Patent office. ‡dWashington [D.C.] : G.P.O., 1920 ‡w(OCoLC)903470227
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