NSDAP membership book - BMW I.D. grouping - Maassen

Interesting I.D. grouping of Werner Maassen who was a engineer.1) NSDAP membership book of Maassen.2) Wehrpass of Maassen withfew entries.3) Arbeitsbuch of Maassen with BMW :Flugzeugwerke' ,Niederbarnimer 'Flugmotorenwerke' and Kalag A.G. entries.4) 'Ausweis' (I.D.) for the Niederbarnimer 'Flugmotorenwerke' (BMW Brandenburg) 1942.5) 'Ausweis' (I.D.) for the Niederbarnimer 'Flugmotorenwerke' (BMW Brandenburg) 1943.6) Niederbarnimer 'Flugmotorenwerke' Ledigenheim II 'Lagerausweis' (I.D.)7) Very nice linen BMW I.D.8) Kalag AG (Kabel und Leitungs AG) I.D. pass for the Kalag firm which was situated in the underground facility at Stassfurt which was constructed by forced labour of prisoners of Buchenwald.Very unusual I.D. grouping!!