Safety road channelizer

Details Safety road channelizer Safety road channelizer

1990-11-01

1991-09-24

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

Patent

active

D03201724

REFERENCES:
patent: 2762328 (1956-09-01), Weig
patent: 2957444 (1960-10-01), Boettler
patent: 3099244 (1963-07-01), Knapp
patent: 3132624 (1964-05-01), Shoemaker, Jr.
patent: 3496904 (1970-02-01), Rimkus
patent: 3618556 (1971-11-01), Dittrich
patent: 4772869 (1988-09-01), Grammas et al.
patent: 4925334 (1990-05-01), Beard

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