Newsletter|
|
||||
Portable Step and Bridge Ladder, System Porta (1874) |
||||
|---|---|---|---|---|
 Pinche para ampliar
|
Description
The image shows a CAD model of a mobile ladder, which consists of intermateable separate ladder segments. The image shows the ladder in the upright, put together state. The mechanic Paul Porta, who lived in Milan, applied this ladder for a patent in 1874. |
|||
| Linked items | ||||
|
||||
| Permanent links | ||||
|
||||
| Data provider | ||||
|
||||
| Administrative information | ||||
|
||||
DMG-Lib
Ilmenau TU
