| 摘要 |
<p>1307746 Removing dust from two for one twisters J R PLANAS 22 May 1970 [24 May 1969] 24959/70 Headings DID and D1F The housing for a 2 for 1 twister is provided with at least one opening 5 in its wall which is connected to a suction duct 11 so that dust &c can be sucked from the housing into the duct. The openings can be formed as a vertical series of horizontal slots. (For Figure see next column)</p> |
