A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A self leveling stepladder with a universal hinge joint providing many new advantages that traditional a-frame step ladders are not capable to offer.
A self leveling stepladder with a universal hinge joint providing many new advantages that traditional a-frame step ladders are not capable to offer.
Self leveling step ladder
HUME DAVID J (author)
2020-06-23
Patent
Electronic Resource
English
IPC:
E06C
LADDERS
,
Leitern