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Portable Step and Bridge Ladder, System Porta (1874) |
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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. |
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DMG-Lib
Ilmenau TU
GERMANY
SPAIN
ROMANIA
FRANCE
ITALY
