1. HE 17017, manufactured by Hartel Enterprises, 12970 Branford, Pacoima, CA 91331, USA.
2. Weldon 40, manufactured by IPS Corporation, Gardena, CA 90249, USA.
3. BC-630, produced by Bicron Corporation, 12345 Kinsman Road, OH 44065, USA.
4. BC-634, optical interface disks manufactured by Bicron Corporation.