![](http://www.alamy.com/thumbs/6/EDA87C6F-9E79-4C9A-AADA-A4191B88C9A1/2WN8538.jpg)
Max von Pettenkofer (1818-1901), German chemist and hygienist, Breathing apparatus, , (encyclopedia, 1888), Max von Pettenkofer (1818-1901), deutscher Chemiker und Hygieniker, Respirationsapparat, Max von Pettenkofer (1818-1901), chimiste et hygiéniste allemand, appareil respiratoire
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