Through a conference of Electrotecnicians in 1920, he presented the Termenvoksa or Heterophone, or Theremin, as it was named internationally. Those in the conference observed a small box with two antennae, one on the correct and a person about the left. Could it's a completely new form of telegraph? Or https://remingtonlfwrh.59bloggers.com/38840346/what-does-mezzanine-safety-gates-mean