(57) A rotary body (12) located within a treating tank (1) is electro-magnetically rotated,
and by means of a rotary body, such treatments, as mixing, stirring, agitating, kneading,
dispersion and the like will be effected. The rotary body is made of conducting material
and an electro-magnetic coil (10) which generates a revolving magnetic field is located
adjacent the rotary body. Since the rotary body is separated from a driving source,
the treating tank provided with the rotary body can be made sealable.
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