AR222859A1
(en )
1981-06-30
SEWAGE TREATMENT PROCEDURE
ES489861A0
(en )
1981-03-16
DRINKING WATER TREATMENT PROCEDURE
SE7810758L
(en )
1979-05-01
WASTEWATER TREATMENT
BR8004475A
(en )
1981-04-28
SEWAGE CONTENT TREATMENT APPLIANCE
AR219788A1
(en )
1980-09-15
SEWAGE TREATMENT PROCEDURE
NO803438L
(en )
1981-05-18
SEWAGE WASTEWATER TREATMENT.
AT363871B
(en )
1981-09-10
WASTEWATER PURIFICATION PLANT
IT1198367B
(en )
1988-12-21
WASTEWATER TREATMENT PLANT
JPS5667562A
(en )
1981-06-06
Sewage disposal plant
IT7924414A0
(en )
1979-07-17
TREATMENT PROCEDURE FOR BIODEGRADABLE EFFLUENTS.
BR5900021U
(en )
1980-08-26
SEWAGE TREATMENT PLANT
BR8100134A
(en )
1981-07-28
FOUNDATION PLANT CONTINUES DOUBLE
PL205471A1
(en )
1979-11-19
BLOCKED SEWAGE TREATMENT PLANT
BR7905086A
(en )
1981-01-27
ONDA-MAR-MOTRIZ II PLANT
PL195534A1
(en )
1978-07-31
BIOLOGICAL SEWAGE TREATMENT PLANT
PL107745B1
(en )
1980-02-29
BIOLOGICAL SEWAGE TREATMENT PLANT
PL102805B1
(en )
1979-04-30
BIOLOGICAL SEWAGE TREATMENT PLANT
RO78501A2
(en )
1982-03-24
WATER TREATMENT PROCEDURE
SE7610325L
(en )
1978-03-18
PROCEDURE FOR CARRYING OUT BIOLOGICAL WASTE WATER TREATMENT
CY1154A
(en )
1982-09-10
Sewage treatment plant
PL198249A1
(en )
1978-03-28
AERATING CHAMBER OF THE SEWAGE TREATMENT PLANT
PL209702A1
(en )
1979-08-13
COMBINED MECHANICAL AND BIOLOGICAL TREATMENT PLANT FOR MUNICIPAL SEWAGE
PL198244A1
(en )
1978-11-20
METHOD OF DRAINAGE OF SLURES ON THE DRYING PLOTS OF THE SEWAGE TREATMENT PLANT
PL205725A1
(en )
1979-11-19
DEVICE FOR THE BIOLOGICAL TREATMENT OF SEWAGE, ESPECIALLY HIGHLY CONCERNED INDUSTRIAL SEWAGE
IT1090907B
(en )
1985-06-26
WASTEWATER TREATMENT PLANT USING LONG DEGREE SEWAGE CONDUCT