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Details and Image
Type
Model #.
Aircraft Maker / Name
Instrument Maker
Country
Construction
Date
Scale Length
Area of Use
Disk
Mark IX
Generic
Felsenthal & Sons
U.S.A.
Plastic
c. 1968
Dia. = 9.5 cm
Aviation Calculations
Comment:
"Used for aviation air speed, density altitude calculations, reverse has a Den-Alt (desity altitude) calculator for takeoff performance calculations"
Image 1
Image 2
