Clearday Inc (CLRD)

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yes, still quite a large niche market though.
Overall cable market is HUGE.
superconducting advantages can be used in a small section of that entire market.

most noticable

-Wind turbines (much smaller and more effective with bigger output)

-CERN NASA applications

-Fault current limiters

-Clogged urban areas

Also very usable in places as part of smart grid.