FR431552A
(en )
1911-11-14
Dirty water purification device
CH1876A
(en )
1890-05-31
Sophisticated settling device intended particularly for water purification
FR388306A
(en )
1908-08-08
Apparatus for industrial water purification
CH4814A
(en )
1892-08-15
Device for the purification and filtering of industrial and domestic water
FR446383A
(en )
1912-12-03
Device intended for the purification and filtration of drinking and industrial water
FR321408A
(en )
1903-01-09
Water purifier
CH2207A
(en )
1890-09-15
Dervaux purifier-settler for water purification
CH57997A
(en )
1913-02-17
Dirty water purification device
FR468763A
(en )
1914-07-16
Device for the purification of waste water
CH1695A
(en )
1890-03-31
Apparatus for welding pipes by electricity
FR480408A
(en )
1916-08-03
Water softening process and apparatus for carrying it out
CH3840A
(en )
1892-01-15
Enrichment apparatus for natural lime phosphates
FR430705A
(en )
1911-10-23
Apparatus for purifying water used to supply boilers or for other purposes
FR13647E
(en )
1911-05-19
Purification device for all waste water
FR17710E
(en )
1913-11-13
Purification device for all waste water
FR368868A
(en )
1906-12-19
Method and apparatus for industrial water purification
CH443A
(en )
1889-03-25
Steam boiler feed water purifier system and others
CH65550A
(en )
1914-08-01
Water purification device
FR349918A
(en )
1905-07-27
Decanter for industrial water purification
FR397774A
(en )
1909-05-17
Method and apparatus for softening and purifying natural or polluted water intended primarily for supplying steam boilers and for industrial purposes
CH1122A
(en )
1889-09-11
Worker's goggles
FI347A
(en )
1889-10-25
Taktäckningsmaterial benämdt "takwäf"
CH1487A
(en )
1890-06-14
School-bag
FR17530E
(en )
1913-10-02
Water purification device
FR471879A
(en )
1914-11-13
Water purification system