A movable index mounted on a base sheet for reciprocal movement which movement is controlled, guided and limited by track means and track-follower means.
申请公布号
US4893839(A)
申请公布日期
1990.01.16
申请号
US19880272368
申请日期
1988.11.17
申请人
WILSON JONES COMPANY
发明人
PODD, GEORGE O.;MANGLER, ROBERT J.;MARSLAND, ANNE J.