number of the present machines would be needed or a radical
departure in design (particularly with respect to the steppin~
mechanism) would be necessary to adequately attack the problem.
Dutch Usage. The Dutch Navy uses enigma machines in some of
its traffic circuits. There is reason to believe that they
use a 11-15-17 machine, but no traffic in the system has been
read to date. L8ck of cribs make usual bombe techniques un-
available - the multiple turn-over features would make a stat-
istical bombe approach (for known wiring) a long procedure.