Arthur S. Iberall developed the Lines of Non-Extension concept/suit at the National Bureau of Standards in 1947. The physics, physiology, and orthopedics that were required to understand the major forces exerted by a human body on clothing and how the forces could be distributed with a woven network were presented to David Clark in 1951 at the Navy's request. At this demonstration, the full pressure suit was pressurized to 2 psi. In 1955, while working at the Rand Development Corp, Iberall built the second prototype and demonstrated it under 3.75 psi to the Air Force at the infamous 1955 meeting that led to development of the first true space suits for the X-15 project. Dave Clark patented the woven network as Linknet and went on to use it for the X-15 and Gemini space suits. Iberall's technical description of the Lines of Non-Extension Suit was not allowed to be published until 15 years later (Iberall, A.S., "The experimental design of a mobile pressure suit", Journal of Basic Engineering, Transactions of the ASME, June 1970, p. 251-264.