This is 3D printable old Mining Air Control Device scanned via 3D scanner. It was used in early 20th century for assessing mining gas concentration in underground mines.
The model can be used only for decoration.
3D scanned with Artec Eva http://www.artec3d.com/
This object is a cultural heritage exhibited in the Regional Historical Museum of Pernik.
3D printing of this item must comply with the applicable legislation and must be with size different with at least 10% from the original and additional details should be added.