They sound like telephone switchboard lamps.   Just google that search term 
to see them.   They are on EPay all the time.

On Thursday, December 18, 2025 at 11:54:40 AM UTC-5 Tom Katt wrote:

> On Thursday, December 18, 2025 at 11:41:42 AM UTC-5 Mac Doktor wrote:
>
>
> The "bulbs" are long and polygonal with contacts running down the sides. 
> They slide in and out of the switch.
>
>
> Now that you mention that - you are 100% correct!   They were very unique 
> and I had never seen anything like them before.  Originally I thought they 
> would have been the types used in multi-line telephone sets, but they are 
> different. 
>

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