CATALYST FOR FLAMELESS BURNING OF GAS FUEL IN PUBLIC AND INDUSTRIAL INSTRUMENTS AND PLANTS, ESPECIALLY IN SUCH ANE INDUSTRIAL INSTRUMENTS AND PLANTS, ESPECIALLY IN SUCH ONE FOR HEA... von PIPEROV, BORIS B, MEKHANDZHIEV,DIMITR R, DIMITROVA,PENKA G, DIMITROV,ALEKSANDR T, BLIZNOKOV,GEORGI M

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CATALYST FOR ELIMINATION THE EXHAUST GASES OF ENGINES PART.OIL AND PETROLE ENGINES von PIPEROV,BORIS B.,BG, BLISNAKOV,GEORGI M.,BG, MECHANDZIJEV,DIMITER R.,BG

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CATALYST FOR MAKING HARMLESS OF NITROGEN OXIDES IN GASES von BLIZNAKOV,GEORGI M, PIPEROV,BORIS B, MEKHANDZHIEV,DIMITR R, PANAJJOTOV, DIMITR A

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CATALYST FOR NEUTRALIZING ENGINE EXHAUST GASES von BORIS BOZHANOV PIPEROV,BG, DIMITER RUSSEV MEKHANDZHIEV,BG, GEORGI MANUILOV BLIZNAKOV,BG

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DE2622319 von PIPEROV, BORIS BOSCHANOV, MECHANDSCHIEV, DIMITER RUSSEV, BLISNAKOV, GEORGI MANUILOV., SOFIA/SOFIJA, BG

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