| Explode The "H"  SCVSDA Notes  -  October 1982 |    | 
| This definition is from SCVSDA Note Service by Bill Davis. It is provided here for informational and educational purposes only. | 
| Switch To An H  SCVSDA Notes  -  October 1982 |    | 
| This definition is from SCVSDA Note Service by Bill Davis. It is provided here for informational and educational purposes only. | 
| Switch To An Interlocked Hourglass  SCVSDA Notes  -  April 1984 |    | 
| This definition is from SCVSDA Note Service by Bill Davis. It is provided here for informational and educational purposes only. |