... General instrument and oxygen equipment ... Air ministry (Directorate of research).
Edition: May, 1921.
Series: [Great Britain]  Air ministry.; 3881
Publisher: H. M. Stationery off.
Published: 1921
Place of publication: London
Language: eng
Number of pages: 121
Subjects: Aeronautical instruments.; Airplanes -- Equipment and supplies.
Other titles: Oxygen equipment.