Two factors dictate the design of an ideal brace: 1  Joints adjacent to the thumb CMC joint must be excluded to maximize function when wearing the brace; thus a design using three points of pressure cannot be used. 2  The brace must specifically prevent CMC dorsal translation.
Expansion valve. An expansion valve is a valve used for different purposes: Steam engines. A valve used to control the expansion of steam: Expansion valve (steam engine) The best-known of these was the Meyer expansion valve, the invention of Jean-Jacques Meyer.
Nov. 16, 1904: Vacuum Tube Heralds Birth of Modern Electronics. 1904: British engineer John Ambrose Fleming invents and patents the thermionic valve, the first vacuum tube. With this advance, the age of modern wireless electronics is born.