Openable ring

Details Openable ring Openable ring

1987-05-13

1991-05-28

Dunkins, Bruce W.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

D 8367, D 8368, D19 86, D19100

Patent

active

D03171779

REFERENCES:
patent: D178862 (1956-10-01), Blod
patent: D758685 (1930-05-01), Boye
patent: 2711555 (1955-06-01), Hauson
patent: 3315297 (1967-04-01), Bender
patent: 4308637 (1982-01-01), Kucera
Ginn's Office Supply Catalog.RTM., 1984, p. 254, see loose leaf book ring, lower left Desk Copy.

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