Drain field tile
United States Patent 3233414
US Patent References:
/0728088.html
- - 0728088

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Inventors:
Hansen Jr., Robert A.
Hansen, Doris C.
Publication Date:
02/08/1966
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Assignee:
Hansen Jr., Robert A.
Hansen, Doris C.
Primary Class:
405/50
International Classes:
E02B11/00
US Patent References:
2795542Disposal of septic tank effluent and the like
2874844Filter beds and tile
3060693Dry well forming receptacle
3091087Blocks for protecting hydraulic constructions
Foreign References:
DE366700C
GB280242A
GB431309A
GB436326A