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Elestra made miniature Thyratrons and the ER2 is one of a series. Sadly almost no data is available for them.

There is a central cylinder and an angled plate to one side. There will also be a trigger electrode. The envelope will be filled with a low pressure gas.

The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 45 mm tall.

Reference: Observation.