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https://www.areatecnologia.com/herramientas/manome h. b. & brigham young university. statistics instr (3) christensen w. w. (2005). bioestadistica / biostatistics: base (1) daniel https://www.cursodesoldadura.org/soldadura-electri https://www.soldaduras.info/aprender/soldadura-ele https://www.solyman.com/tecnica-soldadura-electric https://www.ewm-group.com/es/fachwissen/e-hand-gru https://www.escueladesarts.com/blog/soldadura-elec