The path inside the mask is such that the inhaled air is introduced from the tube in the front compartment and then in the oronasal compartment and the air exhaled from the oronasal compartment travels on a perimetric path of the mask up to the tube.
MASKS FOR UNDERWATER USES
2017-04-06
Patent
Elektronische Ressource
Englisch
IPC: | B63C LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS , Zuwasserlassen, Trockenstellen, Docken oder Bergen von Schiffen |
Engineering Index Backfile | 1943
|Nanostructuring repairs lithographic masks
British Library Online Contents | 2000