Chart device

Details Chart device Chart device

1976-06-18

1977-05-17

Pitrelli, John F.

Card, picture, or sign exhibiting

Display card

Having a curved display panel

35 7A, 40142A, G09F 704

Patent

active

040232905

ABSTRACT:
The present application discloses display systems and devices using magnetic means for retaining a plurality of layers of material on a display board.

REFERENCES:
patent: 2177905 (1939-10-01), McKeehan
patent: 2693370 (1954-11-01), Wheatley
patent: 2959832 (1960-11-01), Baermann
patent: 3186323 (1965-06-01), Niehaus
patent: 3228133 (1966-01-01), Baermann
patent: 3603592 (1971-09-01), Bury
patent: 3711991 (1973-01-01), Orfei et al.
patent: 3716935 (1973-02-01), Friederichs
patent: 3874103 (1975-04-01), Muta
patent: 3942147 (1976-03-01), Josephson
Charles Mayer Studios Inc., Rubber Magnet Brochure, 1960.

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