An improved gear for automatically controlling the operation of pumps or other delivery devices in accordance with the rate of flow of a fluid or quantity of a solid
摘要
申请公布号
GB497109(A)
申请公布日期
1938.12.13
申请号
GB19370025744
申请日期
1937.09.22
申请人
JOHN JAMES EDWARD SCOWEN;WILLIAM BOBY & COMPANY LIMITED
