In 1959, the company SPIROSUB was located in Genova. The Mistral was produced by license from Spirotechnique.
It is a single-stage double hose regulator.
The Spirosub Mistral follows exactly the basic scheme from Spirotechnique, with only two variants:
- There is a lip border at the membrane that fix it on the cover of the regulator;
- The exhaust valve has a wide and straight rubber terminal placed inside a transparent box
In addition, as an accessory, for breathing on surfaces incorporated in the mouthpiece, equipped with a command
rotating to switch from a breathing system to other.
1. HDS NOTIZIE N. 52 - Settembre