Section for a portable warning barricade

Details Section for a portable warning barricade Section for a portable warning barricade

1982-06-09

1984-12-18

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

Patent

active

D02767970

REFERENCES:
patent: D63260 (1923-11-01), Isaacs
patent: D74859 (1928-04-01), Alexander
patent: D77883 (1929-03-01), Butler
patent: D245045 (1977-07-01), Donahue
patent: 1818624 (1931-08-01), Hover
patent: 2517982 (1950-08-01), Crocker
The Union Metal Manufacturing Co., Danger School Zone, 1932, p. 4, Traffic Boys on upper portion of page.

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