FR431552A
(en )
1911-11-14
Dirty water purification device
CH57997A
(en )
1913-02-17
Dirty water purification device
CH65550A
(en )
1914-08-01
Water purification device
FR442846A
(en )
1912-09-10
Water purification device
CH58928A
(en )
1913-07-01
Waste water purification device
FR426646A
(en )
1911-07-11
Device for the purification of waste water
FR457224A
(en )
1913-09-13
Water purifier
FR388306A
(en )
1908-08-08
Apparatus for industrial water purification
FR468763A
(en )
1914-07-16
Device for the purification of waste water
FR462733A
(en )
1914-02-03
Water sterilizer
FR461622A
(en )
1914-01-07
Apparatus for the purification of black water
FR458552A
(en )
1913-10-14
Transportable device for cleaning water drainage pipes and others
FR438732A
(en )
1912-05-25
Inhalation device
FR430705A
(en )
1911-10-23
Apparatus for purifying water used to supply boilers or for other purposes
FR446383A
(en )
1912-12-03
Device intended for the purification and filtration of drinking and industrial water
FR447168A
(en )
1912-12-26
Sewage treatment device
FR455968A
(en )
1913-08-13
Device for water purification
FR446769A
(en )
1912-12-14
Device suitable for settling water
CH65980A
(en )
1914-08-17
Training device
FR453442A
(en )
1913-06-07
Evaporation apparatus
FR473453A
(en )
1915-01-13
Ozonator for water sterilization
FR13647E
(en )
1911-05-19
Purification device for all waste water
FR17710E
(en )
1913-11-13
Purification device for all waste water
FR466183A
(en )
1914-05-06
Injection device
FR398156A
(en )
1909-05-28
Device to purify hard water