Trying to contact Harrison and Harrison Optical

Does anyone know whether Harrison and Harrison Optical has changed their address or phone number. I have been buying filters from them for a number of years and their old phone number is now listed as no longer in service. 559 782 0121 is the old number. I hope this doesn't mean they are out of business. Any info on contacting them would be appreciated.
D.W.

Harrison & Harrison

The latest contact information I have for H&H is:

Harrison and Harrison
| 1835 Thunderbolt Drive, Unit E,
Porterville, CA 93257
| 559-782-0121 | e-Mail: HarrisonOP@aol.com