Improvements in or relating to apparatus for obtaining indications and records of the average speed of movement of a movable member during an interval of time
摘要
申请公布号
GB424782(A)
申请公布日期
1935.02.28
申请号
GB19330023964
申请日期
1933.08.29
申请人
ELLIOTT BROTHERS (LONDON) LIMITED;GEORGE FREDERICK SHOTTER
