INERNATIONAL ROAD ROUTE RECORDING AND INDICATING DEVICE

摘要

1395705 Indicators C H FENN 8 May 1972 [6 May 1971] 13507/71 Heading G5C A route indicator consists of three or more overlapping rotatable discs 3 mounted between plates 1, 4 apertured at 2 to reveal route direction symbols marked on each disc, the discs being circumferentially serrated to permit their manual rotation to select the desired symbols for display. Surface 5 may be an erasable carbon paper scribble pad. The indicator may consist of a single plate only to which the discs are riveted, and may also include lighting means.