and product redesigns intended to conserve raw materials essential to the war effort, positioned the company to fulfill the military's needs for specialized microphones. The T-17 Battle Announce Microphone was the most widely used microphone in the U.S. Army and Air Force during World War II, and featured a plastic case that conserved aluminum and lighter and more reliable in a wide range of temperatures and climates. A waterproof version was used on nearly all U.S. Navy ships. Shure also designed the T-30 Throat Microphone for flight crews. A cloth strap held the T-30 against the throat, capturing the user's voice box vibrations directly and avoiding the background noise of the airplane. Shure also manufactured specialized headsets and the MC-1 oxygen mask microphone. In yet another example of the widespread use of Shure microphones by the U.S. military, U.S. lookout Private Lockhard used a Shure 700A microphone to announce his sighting of Japanese planes approaching Pearl Harbor on the morning of On December 7, 1941. The Shure SM series of microphones began with the introduction of the SM57 in 1965 and the SM58 in 1966. The SM (Studio Microphone) series microphones were originally developed with a non-reflective finish and no on-off switch for the TV studio market. The SM57 is well known for its durability and the versatile sound characteristics, much attributable to the Ernie Seeler-designed Unidyne III capsule. Produced since 1965 and still in production today, it has been widely used in many applications, including micing vocals, drums, and guitar amplifiers both in live sound and recording applications, including being used by every United States President from Lyndon Baines Johnson on. The SM57 was inducted into the TECnology Hall Of Fame in 2004. Together, the Shure SM57 and SM58 have been the two bestselling microphones in the world since the late 1960s. Their feature set is nearly identical, with the main difference between the two being their different grilles. Shure later expanded the SM series, which now include such models as the now hard to find SM53 & SM54 (which were low proximity effect microphones), SM45, SM48, SM56, SM57, SM58, SM85, SM86, SM87A, SM94, and the SM81 which is a longtime recording studio standard. Shure introduced Beta Series microphones in 1989. These feature a supercardioid designs based on SM series microphones, but with neodymium magnet structures for higher output. The series also included two new microphones specifically for drums,