Method and device for the automatic determination of the biochemical oxygen need for water
DD253245A1
Method for removing surfactant substances from water
DD252685A1
Method and device for controlling water toxicity by reducing the residence of fishing
DD248434A1
Process for preparing leakage from bleis sulfate for turbidimetric analysis of sulphate in water
DD259758A3
Method and apparatus for automatically controlling a pressure air operated membrane pump for water support from groundwater observation tubes
DD243346A1
Method and device for the teach-faced removal of water samples from groundwater observatory tubes
DD241890A1
Method for removing cyanide complexes from heavy metals from water
DD235109A1
Device for determining the use of water for dust maintenance
DD225685A1
Method for cleaning ammonium and phenolic acids of thermal brown cooling
DD226077A1
Device for examining core-filter materials on expressive ingredients
DD226652A1
Method for examining combined filter materials on extractable ingredients
DD232082A1
Method for capacity extension of the operating room of multipurpose lockers
DD208285A3
Method of punching cladding through a stabilized flexible film hose
HU181025B
Device for pressure filtering with semi-permeable membrane
DE2819848A1
Mechanical sepn. of emulsions - using settling vessel followed by pressure separator with capillary membrane followed by cooler, decanter and recycle
DE2818494A1
Semi-permeable membrane filter for protein solns. - having flat circular plate supports held between flow plates with ribs and central formed seal sections
DD130332A1
Process for biological cleaning of liquid animal products
DE1957865A1
Apparatus for scraping of and conveying thin - layers of sludge from sludge drying beds
DE1928730A1
Charging of water with oxygen and chemicals without - disturbance of the natural stratification
GB1217398A
An apparatus for the separation of solid matter from a liquid suspension containing it
