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Sewage disposal septic tanks

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1. AN OULET TRAP FOR A SEPTIC TANK COMPRISING: (A) A PLURALITY OF DISC-DAM UNITS, (1) EACH UNIT COMPRISING (A) A DISC-LIKE AND (B) A CONTINUOUS ELONGATE DAM ARRANGED ON SAID BASE AND EXTENDING FROM ONE SIDE OF SAID BASE TO THE OTHER SO AS TO SEPARATE SAID BASE INTO AN UPSTREAM PORTION AND A DOWNSTREAM PORTION, (1) SAID DOWNSTREAM PORTION OF SAID BASE BEING IMPERFORATE; (2) SAID UNITS BEING ARRANGED IN SUPERPOSED STACK-FORMING RELATIONSHIP SUCH THAT THE BASE OF EACH UPPER OVER-LYING UNIT (A) IS SPACED FROM THE UPPER EDGE OF THE DAM OF THE UNDER-LYING UNIT AND (B) COOPERATES THEREWITH TO FORM A HORIZONTALLY ELONGATE VERTICALLY NARROW OUTLET SLOT; (3) SPACING MEANS FOR HOLDING SAID UNITS IN SPACED RELATIONSHIP, AND
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