|
US1943039A
|
|
Proportioning and feeding device
|
|
US1842153A
|
|
Fluid proportioning apparatus
|
|
US1784893A
|
|
Water-treating apparatus
|
|
US1685246A
|
|
Container and method of making the same
|
|
US1681955A
|
|
Container
|
|
US1611422A
|
|
Process of regenerating zeolites
|
|
US1693284A
|
|
Process of preparing natural zeolites
|
|
US1572944A
|
|
Process of softening water
|
|
US1548160A
|
|
Apparatus for filtering and softening water
|
|
US1418013A
|
|
Process of purifying and decolorizing water
|
|
US1139402A
|
|
Apparatus for sewage disposal.
|
|
US1150673A
|
|
Fluid-feeding apparatus.
|
|
US1149750A
|
|
Water-purifying apparatus.
|
|
US1138634A
|
|
Process for separating detritus from liquids.
|
|
US1056779A
|
|
Cleaning apparatus for swimming-pools and the like.
|
|
US1149045A
|
|
Water-purifying apparatus.
|
|
US922025A
|
|
Water-purifying apparatus.
|
|
US973424A
|
|
Water-purifying apparatus.
|
|
US984635A
|
|
Water-purifying apparatus.
|
|
US996923A
|
|
Chemical feeder and saturator.
|
