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This exhibit is a radiation detector. The label gives the operating voltage as 410 Volts.

Thanks to Rob Coleman for the identification. The G10H is almost identical but has a working voltage of 400 Volts.

The construction is of a thin outer cylinder with a central metal rod within.

The top of the envelope. The central rod is fixed into a glass support suggesting a high operating voltage.

The wide glass tube envelope is 27 mm in diameter, and excluding the B4 base pins is 185 mm tall.

References: Observation and Rob Coleman.

Absolute Maximum Operating Conditions^¶