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  2. Chinese siege weapons - Wikipedia

    en.wikipedia.org/wiki/Chinese_siege_weapons

    A fork cart A hungry falcon cart. Hook carts such as the fork and falcon carts were used to pull down parapets and the top part of walls to make it easier for ladders to access. Once attached, 50 to 100 men took hold of a rope and pulled until the wall came down. They were used as early as the Three Kingdoms period, as mentioned by Chen Lin:

  3. John H. Balsley - Wikipedia

    en.wikipedia.org/wiki/John_H._Balsley

    John H. Balsley (May 29, 1823 – March 12, 1895) was a master carpenter and inventor, inventing a practical folding wooden stepladder and receiving the first U.S. patent issued for a safety stepladder in the year. He was born in Connellsville, Fayette County, Pennsylvania to George H. and Sarah (Shallenberger) Balsley. His father was also a ...

  4. Werner Co. - Wikipedia

    en.wikipedia.org/wiki/Werner_Co.

    Werner Co. was founded in 1922 by Richard D. Werner as "R. D. Werner Co., Inc.," which specialized in metal moldings.R. D. Werner Co., Inc. became a leader in plastics extrusion during the World War II restrictions on civilian metal usage.

  5. Waterladder pump - Wikipedia

    en.wikipedia.org/wiki/Waterladder_pump

    The water ladder was built as an alternative to the paddle wheel to get around the problem that to lift water to a greater height, a bigger wheel is needed. [1] Despite the emergence of new pumps that operate on other principles, the water ladder remains an important tool as some of its other benefits are that they can be built and repaired easily at a very low cost.

  6. General Dynamics F-16XL - Wikipedia

    en.wikipedia.org/wiki/General_Dynamics_F-16XL

    The SCAMP design team in late 1977, starting left: Harry Hillaker, Andrew Lewis, Kenny Barnes, Jim Gordon. Shortly after winning the lightweight fighter program, General Dynamics Fort Worth began investigating possible F-16 derivatives with the goal of enhancing both air-to-air and air-to-ground mission capabilities while retaining parts commonality with the F-16A. [1]

  7. Tree stand - Wikipedia

    en.wikipedia.org/wiki/Tree_stand

    A ladder stand has a seat and platform that connect to the tree with the ladder coming off the front of the platform to give the hunter access to the stand. Ladder stands are stationary because of the size and lack of ability to move through the woods quietly. Stability is good because of the connection to the tree and support from the ground ...