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公开(公告)号：US1210891A
公开(公告)日：1917-01-02
申请号：US4306415
申请日：1915-08-02
Applicant: ASHCROFT MFG COMPANY
Inventor： BLANCHARD FREDERICK C , CROCKER ERNEST B , KEEFER PHILIP S
CPC classification number: G05D16/0663 , Y10T137/261 , Y10T137/7613 , Y10T137/794 , Y10T137/8175 , Y10T137/87917
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