000			003100000a22001330004500
245			_aHelical springs
110			_aSpring Research Association
260			_aLondon _bO.U.P. _c1974
300			_a16p.
440			_aEngineering Design Guides ; 08
080			_a620-272 _bS7
041			_aEN
942			_cBK
999			_c102147 _d102147