00381nam a2200133 a 4500008004100000050001900041100001500060245007000075260003900145300002200184350000900206700001400215700001800229120416s1969    ||||||||||||||||| ||    u  aTK 6564.F7 Fre  aThomson, J10aFrequency conversion, parts I, II (and) IIIcedited by J. Thomson  aLondonbWykeham Publicationsc1969  aviii, 207p. : ill  a0.00  aTurk, W.E  aBeesley, M. J