Mart,
I humbly suggest that engineers tend to advance due to what they know and their ability to develop technical sound products. Politicians and promoters tend to advance due to whom they know and their ability to market themselves.
You will find the book 'Heelicopter : pioneering with Igor Sikorsky' very interesting. It is written by William E. Hunt; an early engineer at Sikorsky.
Another book is 'The Helicopter', which is an updated version of 'Anything a Horse Can Do'. It is written by Colonel Frank Gregory of the US Army Air Corps; the initial customer of Sikorsky.
These two books give an insight into Igor Sikorsky and the early years.
handysnaks,
Yes, it is Bob Dylan. He is singing
'Things Have Changed' off of the back of the card.
