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Diathermy is produced by two techniques: short-wave radio frequencies in the range 1–100 MHz (shortwave diathermy) or microwaves typically in the 915 MHz or 2.45 GHz bands (microwave diathermy), the methods differing mainly in their penetration capability. [4] [5] [6] It exerts physical effects and elicits a spectrum of physiological responses.
These were limited to frequencies of 0.1 – 2 MHz, called "longwave" diathermy. The current was applied directly to the body with contact electrodes, which could cause skin burns. In the 1920s the development of vacuum tube machines allowed frequencies to be increased to 10 – 300 MHz, called "shortwave" diathermy. The energy was applied to ...
By the 1930s these were being replaced by "short wave" (10~100 MHz) vacuum tube diathermy machines, [111] [118] which had less danger of causing burns, but Tesla coils continued to be used in both diathermy [111] and quack medical devices like violet ray [125] until World War II.
The Kitson Machine Shop was founded by Richard Kitson in Lowell in 1849. It became well known for its cotton preparatory machines, especially its picker machine. Kitson was acquired by the Lowell Machine Shop in 1905. [9] The Kitson plant in Lowell was closed in 1928, when all of the company's operations were consolidated in Biddeford. [10]
[2] [3] Today, machines with the name Hyfrecator are sold only by ConMed Corporation. However, the word "hyfrecator" is sometimes used as a genericized trademark to refer to any dedicated non-ground-return electrosurgical apparatus, and a number of manufacturers now produce such machines, although not by this name.
Between 1962 and 1966, the company acquired stakes in the Indian company Utkal Machinery and in Talleres de Tolosa in Spain, took over the tooling and paper machine manufacturer Dörries, and established sales offices in UK and France. [32] In 1966, Voith delivered the widest newsprint paper machine in the world to a customer in Sweden.
Manufacturer Country Market share (2019) Dräger: Germany 24 % Weinmann Medical: Germany 21 % Hamilton Medical: U.S., Switzerland 18 % Vyaire Medical: U.S. 5 % Customs Japan 4 % O Two Canada 4 % Smiths Medical U.S. 4 % Medtronic: Ireland, U.S. 4 % Air Liquide Healthcare France 3 % (and 13 other vendors contributing for 13%)
The antenna may not be more than 20 feet (6.1 m) above the highest point of the structure it is mounted to, or the highest point of the antenna must not be more than 60 feet (18.3 m) above the ground (47 CFR 95.408(c)) if installed in a fixed location. [4] CB radios must include AM or SSB modulation and may include frequency modulation. [5]