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If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, withing 24 hours on weekdays.
Customer service
All questions about your order, return and delivery must be sent to our customer service team by e-mail at yourstore@yourdomain.com
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Study of the lives and work of four AmericansIgor Sikorsky, Frank Piasecki, Arthur Young, and Stanley Hiller, Jr.who, working independently but concurrently, developed the helicopter in the 1940s. Discusses the confluence of entrepreneurship, corporate practices, and government influence and financing in the development of helicopter technology, and the applications of the technology for purposes of military, rescue, and commercial transportation. Annotation c. by Book News, Inc., Portland, Or.
⚠️ WARNING (California Proposition 65):
This product may contain chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
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