Security mail vault

Details Security mail vault Security mail vault

1993-08-02

1994-08-23

Douglas, Alan P.

Miscellaneous

Vault, safe, or depository

Mailbox

Patent

active

D03500047

REFERENCES:
patent: 3880344 (1975-04-01), Earle
patent: 4148432 (1979-04-01), Cornwell, Jr.
patent: 4416414 (1983-11-01), Edgerton
patent: 5056711 (1991-10-01), Bush

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