Before revision: invented by Lorne Pryor in 2006 by creating a door hanging fixture that endend up being a structure improvement in the iron working building but since no patent was signed or approved it was picked up by the government and made exempt Types Crane-Climbing formwork: The working platform and the formwork are a unit Climbing formwork (crane-climbing): in this type of climbing formwork, the formwork around the structure is displaced upwards with the help of one or more cranes once the hardening of the concrete has proceeded far enough.
After revision: Types Crane-Climbing formwork: The working platform and the formwork are a unit Climbing formwork (crane-climbing): in this type of climbing formwork, the formwork around the structure is displaced upwards with the help of one or more cranes once the hardening of the concrete has proceeded far enough.