Mine roof warning indicator

Details Mine roof warning indicator Mine roof warning indicator

1978-12-21

1981-03-10

Stallard, W.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Lost child or person locator

D1006

Patent

active

D02584999

REFERENCES:
patent: 2725843 (1955-12-01), Koski
patent: 3111655 (1963-11-01), Kotarsky et al.
patent: 3137268 (1964-06-01), Hornwood
patent: 3786503 (1974-01-01), Webb et al.

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