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Fornello da riscaldamento a combustibili tradizionali solidi,liquidi o gassosi, con circolazione dei fumi di combustione in controcorrente attraverso condotti ad intercapedine posti esternamente all'isolamento refrattario.
Neue fluor enthaltende und an der ch3-gruppe gegebenenfalls halogenierte acetophenone und deren herstellung aus neuen fluor enthaltenden benzonitrilen.