<http://webisa.webdatacommons.org/90987608>	<http://www.w3.org/ns/prov#value>	"Referring to the drawings, and particularly FIG. 1, apparatus similar to that of U.S. Pat. No. 3,846,104 to Seymour, for which the present invention is especially suited, is disclosed." .
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<http://webisa.webdatacommons.org/prov/27926701>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/90987608> .
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