Since ham operators had an assignment at 10 meters, and
the primary user of 11 meters (Medical Diathermy) wouldn't be affected,
it probably seemed like the ideal spot: the only commercial allocations
near it were in the 30-50 MHz range, but assigning a new service there
would have meant displacing existing FM licensees, including many local
government users, who were _also_ interested in keeping their radio
costs down.

I remember medical diathermy in the 50's being an important cause of
TVI. They apparently were available for home use by patients. I never
needed one so I really have no idea what they were supposed to do.
To they still exist? Have they been replaced by a different
technology?

Jon W3JT