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Signalbuch
Internationales Signalbuch · 1931 - this page is a stub

This book is titled Internationales Signalbuch 1931 - Band II, Funkverkehrsbuch (International Signals Book 1931 - Volume II, Radio Traffic Book). It was published by Walter de Grunter & Co in Germany (1931) under the authority of the Reichsverkehrsministerium (National Traffic Ministery).
 
The book is intended for encoding radio traffic that was usually send via the short-wave radio bands (SW) by means of morse code in the days between WWI and WWII. The book contains many standard expressions and (parts of) complete sentences that can be used to shorting messages into a series of 5-letter groups.   
Close-up of the title of the Internationales Signalbuch 1931

More information about this book will be made available in due course. A similar book, that was used for international radio traffic, is the New Boe Code Book.
 
Close-up of the title of the Internationales Signalbuch 1931 The complete codebook of 1931. It is over 6 cm thick! A peek inside the codebook. It contains many chapters on special subjects. Close-up of a page from the codebook

 
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