About the book: year / Abstract: After a rash promise on one of the amateur radio forums to debunk the reckless conceit about the absoluteness of knowledge of everything, and in particular to answer self-confident statement about the non-existence of telegraph keys more complex than the well-known press-and-release, I had to undertake the fulfillment of the promised review. Evening has come. He picked up the collected materials and... And grabbed his head.