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A breathing machine or respirator is a fairly large device, about the size of a small console TV, and powered by electricity. It is precisely the device which you are describing. A close friend uses one and I have seen her use it many times.
The ordinary term for this device in English, at least in American English, is simply 'breathing machine' or 'respirator'. An 'air-purifier' is not a medical machine, but is used in homes, restaurants, etc., merely to freshen and clear the air.
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respiratore ad alimentazione
Explanation: respiratore ad alimentazione
SilvanaCollura Italy Local time: 23:47 Native speaker of: Italian PRO pts in category: 6
MSA: Respiratore con adduzione di aria compressa
Respiratore ad aria compressa indipendente dall'atmosfera ambiente. Va usato in aree la cui aria sia irrespirabile o carente d'ossigeno. ... www.msaitaliana.it/index.php?id=131&L=6 - 28k - Copia cache - Pagine simili
«Col respiratore in casa, felice di poter vivere»
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e un intreccio di fili attaccati a un respiratore artificiale. Pesava 30 chili, mangiava a malapena, parlava a monosillabi e seduto non ci sapeva proprio ... www.medicinaepersona.org/__C1256C23002924DE.nsf/wAll/IDCW-6...$file/pane%20e%20nutella.pdf - Pagine simili
Gian Italy Local time: 23:47 Works in field Native speaker of: Italian PRO pts in category: 216