4. Rotary expansible chamber devices
  5. With supply or exhaust passage in working member
  6. Passage includes vane slot

Lawrence E. Gray

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Apparatus for drilling holes in mine roofs and a roof drill bit

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent

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Radially extended vapor inlet for a rotary multivaned expander

Rotary expansible chamber devices – With supply or exhaust passage in working member – Passage includes vane slot
Patent

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Profile ID: LFUS-PAI-P-763641

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