000			00396nam a22001577a 4500
003			CEME
005			20210628201957.0
008			210416b xxu||||| |||| 00| 0 eng d
040			_c.
082			_a629.8323 POR'I
100			_aPorter, Arthur _957689
245			_aIntroduction to servomechanisms ,with 79 diagrams
260			_aNEWYORK _bJOHN WILEY _c1961
300			_a176P
942			_cBK _2ddc
999			_c567962 _d567962