| 摘要 |
1,190,724. Mixing apparatus. METALLGESELLSCHAFT A.G. 22 Jan., 1969 [25 Jan., 1968], No. 3642/69. Addition to 1,151,009. Heading B1C. [Also in Division F4] The mixer or heat exchanger of the parent Specification 1,151,009 is modified by the use of screws of the same hand and rotated in the same sense.
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