From Flight International, 4th March, 1965 page 346

Luftwaffe Contract for Bryans

The West German Ministry of Defence has recently placed a £68,500 contract with Bryans Ltd, of Willow Lane, Mitcham Junction, Surrey, for the supply of 52 Oxygen Demand Regulator Test Stands, Model 1488/A.

Delivery of the first nine units has already been made. This equipment is used for
testing aircrew oxygen demand regulators for How capacities and oxygen concentration under simulated flight conditions.

Altitudes of up to 70,000ft can be reproduced in the pressure chamber where the
regulator is tested. Provision is made for the accurate control and measurement of
pressures and flows of oxygen through the regulator.

Full facilities are available in Model 1488/A for testing all airborne regulators of European and US origin.