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ГГ-2 Гелий советская газоразрядная гейслеровская трубка Государственный Оптический Институт GG-2 Helium gas discharge geisler tube USSR GOI
Roman Badusov
physics
физика
газоразрядная
спектр
разряд
arc
science
vintage
lamp
tube
voltage
high voltage
diy
наука
электричество
discharge
spectrum
ussr
helium