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Helicopter at exhibition noise abatement, Zurich 1960.
UMG25A31_443

Helicopter at exhibition noise abatement, Zurich 1...

Jet flying operations: mobile noise level measuring, Rümlang 1965.
UMG25A31_230

Jet flying operations: mobile noise level measurin...

Jet flying operations: mobile noise level measuring, Rümlang 1965.
UMG25A29_037

Jet flying operations: mobile noise level measurin...

United States April 2
UMG23A55_481

United States April 2