4. Plastic article or earthenware shaping or treating: apparatus
  5. Female mold including tamping means or means utilizing mold...

William J. Weidman

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Die system for making manhole frame for spherical tanks

Plastic article or earthenware shaping or treating: apparatus – Female mold including tamping means or means utilizing mold...
Patent

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Method of molding a manhole frame for spherical tanks

Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Patent

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Profile ID: LFUS-PAI-P-334556

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