The Christmas issue of New Scientist has a nice article on repro-
ducing pianos and especially about the Stahnke/Rachmaninoff recordings.
See page 68.

On page 78 of the same issue is an article about Hedy Lamar's
involvement with controlling torpedoes.  This proposed a frequency
hopping technique controlled by punched paper rolls.  She and George
Antheil (of Ballet Mechanique fame) were granted a patent on this
in 1941.

Jeffrey Borinsky