Card – picture – or sign exhibiting – Calendars
Patent
1974-02-04
1976-02-24
Wolff, John H.
Card, picture, or sign exhibiting
Calendars
G09F 1100
Patent
active
039395871
ABSTRACT:
A page-turner for books contains a page-turning roller which can be moved from one side of the open book to the other, and which can also be rotated in the desired direction. The unturned pages of the book are kept in position by means of two page retainers.
REFERENCES:
patent: 2494453 (1950-01-01), Reck
patent: 2755580 (1956-07-01), Justice
patent: 3800453 (1974-04-01), Kroes
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