Mailbox signal

Details Mailbox signal Mailbox signal

1988-09-19

1991-02-19

Holtje, Nelson C.

Miscellaneous

Vault, safe, or depository

Mailbox

Patent

active

D03148521

REFERENCES:
patent: 2480469 (1949-08-01), Horn
patent: 4840307 (1989-06-01), Hartman

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