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Softcover reprint of the hardcover 1st edition 1978The use of registered names, trademarks, etc. in this publi,ation does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.We also undertake no guarantee that the contents of this book are free from rights of patent. The publication guarantees neither tacit nor explicit license for existing patents.

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