4. Receptacles
  5. Closures
  6. With condition responsive vent or valve

Walter C. Graybeal

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Manhole closure including a two-way pressure relief valve

Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent

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Manhole closure with a single liquid impervious, two-way gas pre

Receptacles – Closures – With condition responsive vent or valve
Patent

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Manhole cover inflow test device

Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent

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Profile ID: LFUS-PAI-P-81223

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