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the Original Hanau HA-FI 200 was a mercury vapour arc discharge sunlamp with two quartz-tube elements
1971
Original Hanau HA-FI, type 200, a mercury vapour
arc discharge sunlamp with two quartz-tube
elements. The amount of UV-B could be regulated
with the disc above the lamp, controlling the gap
between the upper- and lower filter segments.
building