Signals and indicators – Navigation devices
Patent
1976-06-21
1978-02-07
Sacher, Paul A.
Signals and indicators
Navigation devices
116119, 281 42, 350243, G02B 2702, B42D 1700, B42D 900
Patent
active
040724077
ABSTRACT:
A body having an elongated member adapted to fit along the center line of an open book, provided with means fixed at one end for removably fastening the body to the spine of said book. Auxiliary members received by the body for movement along its length in association with the printed matter in said book.
REFERENCES:
patent: 89307 (1864-04-01), Gridley
patent: 327682 (1885-10-01), Hockett
patent: 569478 (1896-10-01), Wintermute, Jr.
patent: 841237 (1907-01-01), Dudley
patent: 975924 (1910-11-01), Aray
patent: 1405818 (1922-02-01), Dickerson
patent: 2957390 (1960-10-01), Baukus
Punter Wm. H.
Sacher Paul A.
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