Right.

The prefix nano = 1*10^-9
The prefix micro = 1*10^-6
The prefix milli = 1*10^-3

So, before there was nanotechnology, or in other words basically, technology that included the nano prefix, a nanometer (1*10^-9 meters), was called a milli-micrometer (1*10^-3*(1*10^-6)=1*10^-9).