Mail box signal unit

Details Mail box signal unit Mail box signal unit

1980-01-31

1981-07-21

Frazier, Roy D.

Deposit and collection receptacles

Letter boxes

Signals

B65D 9100

Patent

active

042793807

ABSTRACT:
A signal unit which is attached to a mailbox to indicate that its door has been opened is made up of a plate which is frictionally held up against the underside of the box by a spring and a lip that bears on the door.

REFERENCES:
patent: 2581880 (1952-01-01), Price
patent: 2609787 (1952-09-01), Lawson
patent: 2808982 (1957-10-01), Armstrong
patent: 3547070 (1970-12-01), Schuh
patent: 3650464 (1972-03-01), Lewis

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