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Original experimental model of the Person B.1. Fire Detector

Pearson B.1. fire detector with perspex cover

Pearson A type fire detector, 1907

1907

Model of Pyrene fixed temperature fire detector

before 1966

Pyrene fixed temperature fire detector

before 1966

Model of Pyrene rate of rise fire detector

Model of Pyrene fixed temperature fire detector

before 1966

Fixed temperature fire detector

before 1967