Luftwaffe Communication Equipment Instruction Manual: 'Praktische Beispiele der Fernsprechtechnik' (Practical examples of telephone technology) showing instructions for usage with various field telephones (FF33), desk telephones and all related equipment. The manual was published by the 'Luftnachrichtenschule Halle (Saale)' in May 1938. The book is illustrated with many black&white photographs and/or illustrations showing all possible set-ups for usage with telephone technology. This is the first such manual I've seen and certainly very rare and a must have for the (field)telephone collector. Very rare and interesting original manual!