4. Measuring and testing
  5. Volume or rate of flow
  6. Combined

A. Y. McDonald Manufacturing Company

Corporate Assignee

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Holder and shut off valve for a water flow control device

Measuring and testing – Volume or rate of flow – Combined
Patent

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Natural energy operated pump system

Prime-mover dynamo plants – Miscellaneous – Drive gearing
Patent

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Tamperproof rotary valve

Valves and valve actuation – Rotary valves – Plug
Patent

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Tamperproof rotary valve

Valves and valve actuation – Rotary valves – Ball valve
Patent

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