These appear to be similar to the HP modules called AC-4. They use neon lamps.

I built a web page about the HP modules many years ago..

http://www.nixiebunny.com/hpac4/


On 7/25/2014 2:18 PM, gregebert wrote:
Are the bulbs neon, or incandescent ? Someone could theoretically adapt a
nixie-tube clock to drive neon bulbs and use just the shells from the
modules.


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