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  • Thesaurus: Demand valve
First stage breathing regulator
Porpoise Breathing Appliance Company
1953
Second stage breathing regulator
Porpoise Breathing Appliance Company
1953
Siebe Gorman Merlin Mark VI twin hose SCUBA regulator
Siebe, Gorman and Company Limited
1966
Metal fitting from Siebe Gorman air regulator
Siebe, Gorman and Company Limited
1966
Breathing regulator
Airdrive
before 1988