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 protective;
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.
Reference
1. HDS NOTIZIE N. 52 – Settembre 2012
2. http://blutimescubahistory.com/