UN APARATO AMPLIFICADOR DE ALTA FRECUENCIA652,219. Travelling-wave tubes. WESTERN ELECTRIC CO., Inc. Nov. 28, 1946, No. 2191/50. Convention date, Jan. 11. Divided out of 652,155. [Class 39 (i)] In a travelling-wave amplifier, the electron stream is projected at a suitable velocity...
Virus del papiloma humanoCáncer del aparato digestivoFrecuenciaHuman papillomavirusCancer of the digestive tractFrequencyBackground: Helicobacter pylori (Hp) infection is one of the most common infections in humans. Due to its worldwide prevalence, a series of guidelines and recommendations has been ...