Lexington-Concord Sesquicentennial half dollar Monroe Doctrine Centennial, this coin does no credit to Beach's stature as a first-class artist. What the coin exudes in patriotism, it lacks in art." A total of 162,099 Lexington-Concord Sesquicentennial half dollars were struck at the Philadelphia Mint in April and May, 1925, with 99 pieces set aside for inspection and testing by the 1926 Assay Commission. The coins were made from blanks, or planchets, that had been intended for mintage into 1924 Stone Mountain Memorial half dollars, but had not been used. The first coin struck was presented to President Coolidge. The half dollars were sold at the
Metal-insulator-metal Metal-insulator-metal Metal-insulator-metal (MIM) diode is a type of nonlinear device very similar to a semiconductor diode that is capable of very fast operation. Depending on the geometry and the material used for fabrication, the operation mechanisms are governed either by quantum tunnelling or thermal activation. In 1948, Torrey et al. stated that "It should be possible to make metal-insulator-metal rectifiers with much smaller spreading resistances than metal-semiconductor rectifiers have, consequently giving greater rectification efficiency at high frequencies". But due to fabrication difficulties, two decades passed before the first device could be successfully created. Some of the very first MIM diodes