Improvements in or relating to electrical methods of and means for detecting, measuring and recording changes in physical conditions or properties of materials and the like
摘要
申请公布号
GB337785(A)
申请公布日期
1930.10.30
申请号
GB19290023385
申请日期
1929.07.30
申请人
JOHN JOSEPH DOWLING;KENYON STUART GRIEVE SOMMERVILLE
