When the field of application and system requirements make high demands on leakage control and operational reliability, a redundant sealing system is necessary to ensure reliable sealing of hydraulic cylinders at the piston rod. Sealing systems with elastomer-energised polymer seals are a proven answer to widely varying demands for standardised grooves, simple installation, resistance to media, high and low temperatures and pressures.
January 1946: The origins of Heathrow Airport
Interesting the first flight mentioned in your original 1946 article was a Lancastrian "Stardust" which became famous when it disappeared on...