Means for the removal of obstructions and material accumulations
United States Patent 2793083

Inventors:
Hans, Oetiker
Publication Date:
05/21/1957
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Assignee:
BUEHLER AG GEB
Primary Class:
International Classes:
B65G53/66; B65G53/34
US Patent References:
2699970Apparatus for controlling flow of contact material
2727792Pebble gas lift