'Junkers Flugzeug-und Motorenwerke Aktiengesellschaft' - 'Arbeitsbuch' - Kraiß

'Arbeitsbuch' of Paul Kraiß who worked/served with several different airplane /engine related factories.What makes this average 'Arbeitsbuch' of extra interest is the fact ,is the 'Junkers Flugzeug-und Motorenwerke Aktiengesellschaft' added 'Bescheinigung' (certification) of being a 'Flufzeug-Spezialarbeiter' (specialist mecanic)