TENO (Technische Nothilfe) Mechanical Handbook-This is a hardcover copy of the Handbuch fur der Dientfbetrieb der Technifchen Nothilfe. This is a very early handbook, dated 1921/22. It is inscribed on the first page. It contains 427 pages in the first section and includes additional indexing. Within its pages there are what look like paper Teno permits, which are dated 1941. The latter portion of the book looks like it contains an addendum which I cannot date. This book does still have its hardcover, which is tinted in a light green, as are the ends of the pages. The binding of this book is very loose and needs extra care, but as this book is officially 100 years old. It’s in fine shape. Very rare example of a Teno handbuch!