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Centrifugal Separator.

Description: Patent for a centrifuge that can effectively and efficiently separate heavy oils from acids "with which the oil has been mixed or emulsified as a clarifying or decolorizing agent" (lines 14-16), with illustrations.
Date: March 14, 1922
Creator: Paul, Christian F., Jr.

Knee Pad.

Description: Patent for an improved knee pad, which provides better ventilation and cushioning to the knee, including illustrations.
Date: November 21, 1922
Creator: Rylander, Parrish H.
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