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公开(公告)号:US3624941A
公开(公告)日:1971-12-07
申请号:US3624941D
申请日:1969-12-29
申请人: FERRANTI PACKARD LTD
发明人: CHANTRY SYDNEY F
摘要: WITH A MAGNETICALY ACTUABLE REVERSIBLE SIGN ELEMENT A STATIONARY RATCHET ELEMENT LIMITS ROTATION IN ONE DIRECTION AND HOLDS THE ELEMENT AT A POINT WHERE IT MAY ALWAYS BE ROTATED BY REVERSING AN EXTERIOR MAGNETIC FIELD.