1. Intermagnetics General Corporation PO Box 566, Guilderland, New York, USA 12084
2. Emmerson and Cuming, Inc., Canton, Mass 02021
3. Supercon, Inc., 9 Eric Drive, Natick, Mass 01760
4. A vacuum‐tight, all‐metal feedthrough for superconducting current leads
5. Designed and built by James Robinson of this laboratory