The best known is the 3×4cm format Vollenda 48. It was a very compact folding camera making 16 exposures on the 127 film. It existed with a folding frame finder or a folding optical finder.
The lens and shutter combinations included:
- Schneider Radionar 5cm f:4.5 with Pronto 25-100
- Schneider Radionar 5cm f:3.5 with Compur 300
- Schneider Radionar 5cm f:3.5 with Compur-Rapid 500
- Schneider Xenar 5cm f:3.5 with Compur 300
- Carl Zeiss Jena Tessar 5cm f:3.5 with Compur 300
- Leitz Elmar 5cm f:3.5 with Compur 300
- Schneider Xenar 5cm f:2.9 with Compur 300
- Carl Zeiss Jena Tessar 5cm f:2.8 with Compur 300
The cheapest ones had front cell focusing, the most expensive had helical focusing.
At the same time, Nagel was manufacturing the Pupille, a 3×4cm rigid camera that was a more expensive alternative to the Vollenda.
Also were manufactured a few types folding cameras for roll film type 620 (6x9).
- Vollenda 48 at Mike Elek's camera site 
- list of Vollenda types at ukcamera.com 
- Vollenda 620 manual on Mike Butkus's Manual site
- Vollenda with Kodak lens @ www.orphancameras.com
- At Sylvain Halgand's www.collection-appareils.fr :
- Nagel Vollenda (folding) at r-kobus.eu