Directory device and method of operation

Details Directory device and method of operation Directory device and method of operation

1990-01-02

1991-07-30

Smith, Gary L.

Card, picture, or sign exhibiting

Signs

Directory

40611, 40618, G09F 700

Patent

active

050350730

ABSTRACT:
A secure directory device for displaying information on removable plates. The device includes a special key for removing and replacing plates, thereby precluding unauthorized tampering.

REFERENCES:
patent: 664843 (1901-06-01), Epple
patent: 890925 (1908-06-01), Rand
patent: 1079179 (1913-11-01), Kinney
patent: 1096767 (1914-05-01), Tompkins
patent: 1123215 (1915-01-01), Anthony
patent: 1970822 (1934-08-01), Sommers
patent: 3418738 (1968-12-01), Goodman
patent: 3419978 (1969-01-01), Ostrand
patent: 3531884 (1970-10-01), Adler
patent: 3685186 (1972-08-01), Goodman

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