CH2207A
(en )
1890-09-15
Dervaux purifier-settler for water purification
FR2316E
(en )
1904-03-03
Installation for water purification
FR349918A
(en )
1905-07-27
Decanter for industrial water purification
FR388306A
(en )
1908-08-08
Apparatus for industrial water purification
FR468763A
(en )
1914-07-16
Device for the purification of waste water
CH1876A
(en )
1890-05-31
Sophisticated settling device intended particularly for water purification
CH65550A
(en )
1914-08-01
Water purification device
FR394044A
(en )
1909-01-12
Arrangement of filter basins for city water supply
FR457499A
(en )
1913-09-18
Process for water purification and sludge desiccation
FR357679A
(en )
1906-01-09
Apparatus for purifying water by electricity
FR471879A
(en )
1914-11-13
Water purification system
FR442846A
(en )
1912-09-10
Water purification device
FR350264A
(en )
1905-12-18
bacteriological water purification
CH58928A
(en )
1913-07-01
Waste water purification device
FR348840A
(en )
1905-04-27
Water purification process
CH30008A
(en )
1904-10-31
Installation for purifying sewage and other waste water
FR328155A
(en )
1904-02-08
Apparatus for purification of water by electrolysis
FR396606A
(en )
1909-04-16
Apparatus for purifying faecal water
CH4352A
(en )
1892-04-30
Twin hands for watchmaking
FR426646A
(en )
1911-07-11
Device for the purification of waste water
CH990A
(en )
1889-08-26
Apparatus intended for industrial water purification
CH16605A
(en )
1898-12-31
Installation for the purification of black water or sewage
CH4814A
(en )
1892-08-15
Device for the purification and filtering of industrial and domestic water
FR400657A
(en )
1909-08-04
Natural salt water purification process
FR383266A
(en )
1908-03-02
Installation for industrial water purification