Finally, the name came to me :-):

https://www.xkl.com/

Looks like they are still in business.

Mark.

On 10/6/23 16:02, Mark Tinka wrote:

On 10/6/23 15:52, Dave Bell wrote:

Smartoptics?

https://smartoptics.com/

Not them.

I want to say they had an "X" in their name, but memory is fuzzy.

Mark.