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A drawing of a one-seat, three-wheel, open air helicopter by William Cramer ...

A drawing of a one-seat, three-wheel, open air helicopter by William Cramer (PROD 1957).

A drawing of a one-seat, three-wheel, open air helicopter by William Cramer ...

A drawing of a one-seat, three-wheel, open air helicopter by William Cramer (PROD 1957).
John Coleman and an unidentified student discussing helicopter sketches.
John Coleman and an unidentified student discussing helicopter sketches.
John Coleman and an unidentified student discussing helicopter sketches.
John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and an unidentified student discussing helicopter sketches.

John Coleman and unidentified students discussing helicopter sketches.

John Coleman and unidentified students discussing helicopter sketches.

John Coleman and unidentified students discussing helicopter sketches.

John Coleman and unidentified students discussing helicopter sketches.