| 摘要 |
A mixing device such as a concrete mixer is provided in the form of a hollow cylindrical drum with an opening at one end. A lid is engageable with the drum to close the opening. At least one and preferably two baffles are provided within the drum and these are shaped so as to cause an end to end as well as tumbling movement of the contents of the drum when the drum is rolled along a ground surface.
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