4. Conveyors: power-driven
  5. Conveyor frame or casing

George F. Johnson, Jr.

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Apparatus for hauling coal through a mine

Conveyors: power-driven – Conveyor frame or casing
Patent

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Method and apparatus for accurately setting directional headings

Geometrical instruments – Straight-line light ray type – Alignment device
Patent

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Method and apparatus for sampling coal

Measuring and testing – Sampler – sample handling – etc. – Flow divider – deflector – or interceptor
Patent

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Profile ID: LFUS-PAI-P-380421

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