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001 18277
003 OSt
005 20190814091513.0
007 t|
008 190702s1972 xxu||||| |||| 00| 0 d
110 1 _aUnited States Patent Office <Washington>
245 0 0 _aQuestions and answers about patents :
_banswers to questions frequently asked about patents
264 1 _awashington,
_c1972
300 _a14 S.
650 _aPatentwesen
_93556
650 _aUSA
_94716
999 _c10590
_d10590