Mailbox signal flag

Details Mailbox signal flag Mailbox signal flag

1990-11-08

1994-08-23

Douglas, Alan P.

Miscellaneous

Vault, safe, or depository

Element or attachment

Patent

active

D03500071

REFERENCES:
patent: D244679 (1977-06-01), Outerbridge
patent: 3401875 (1968-09-01), Bruhns
patent: 4728028 (1988-03-01), Barnes
patent: 4805834 (1989-02-01), Saba
patent: 4836441 (1989-06-01), Crider
Simmons Hardware Cat., dated 1939, p. 1765 Mailbox with flag.

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