Ring binder

Details Ring binder Ring binder

1986-04-21

1989-09-19

Dunkins, Bruce W.

Office supplies; artists and teachers materials

Book, album or cover

Ring bound or looseleaf type

D19 26

Patent

active

D03035484

REFERENCES:
patent: 1023834 (1912-04-01), Gareis
patent: 1909807 (1933-05-01), Buxton
patent: 3680969 (1972-08-01), Gormau
patent: 3936202 (1976-02-01), Brajituli
patent: 4296945 (1981-10-01), Pavlik

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