000			00532nam a22001577a 4500
008			230315b |||||||| |||| 00| 0 eng d
040			_aNational Science Library _cNational Science Library
080			_aD 025.4:608.3 _bK6
100			_aConnor, John T _93060
245			_aDevelopment and use of patent classification systems
260			_aWashington, D. C.: _bPatent Office United States of America, _c1966
300			_a201p.
650			_aClassification systems
653			_aPatent classification system
942			_2udc _cBK
999			_c9158 _d9158