| http://www.w3.org/ns/prov#value | - In yet another of its aspects this invention provides a vacuum dryer for granular or powdery material where the dryer includes a frame, a cabinet supported by the frame and including an access door, a plurality of canisters carried by the frame within the cabinet and movable serially simultaneously at least among material heating and vacuum drying positions and means for sensing when the door is o
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