65, Nov. 9, 1956 (not available from M.I.T.). [156] , "A communication technique for multipath channels," Proc. IRE, vol. 46, pp. 555-570, Mar. 1958. [157] , "Anti-multipath receiving system," U.S. Patent 2 982 853, May 2, 1961 (filed July 2, 1956). [158] M. G. Nicholson, Jr., "Time delay apparatus," U.S. Patent 2 401 094, May 28, 1946 (filed June 23, 1944). [159] "Lincoln F9C-A radio teletype system," Sylvania Electron. Defense Lab., Mountain View, CA, Instruction Manual EDL-B8, Dec. 21, 1956. [160] D.E. Sunstein and B. Steinberg, "Communication technique for multipath dis- tortion," U.S. Patent 3 168 699, Feb. 2, 1965 (filed June 10, 1959). [161] B. Goldberg, R. L. Heyd, and D. Pochmerski, "Stored ionosphere," Proc. IEEE Int. Conf. Commun., Boulder, CO, June 1965, pp. 619-622. [162] J.R. Pierce and A. L. Hopper, "Nonsynchronous time division with holding and with random sampling," Proc. IRE, vol. 40, pp. 1079-1088, Sept. 1952. [163] A. R. Eckler, "The construction of missile guidance codes resistant to random interference," Bell Syst. Tech. J., vol. 39, pp. 973-994, July 1960. [164] A. Corneretto, "Spread spectrum com system uses modified PPM," Electron. Design, June 21, 1961. [165] R. Lowrie, "A secure digital command link," IRE Trans. Space Electron. Telem., vol. SET-6, pp. 103-114, Sept.-Dec. 1960. [166] R.M. Jaffe and E. Rechtin, "Design and performance of phase-lock loops capa- ble of near optimum performance over a wide range of input signal and noise levels," Jet Propulsion Lab., Pasadena, CA, Progress Rep. 20-243, Dec. 1954; see also IRE Trans. Inform. Theory, IT-1, pp. 103-114, Mar. 1955. [167] E. Rechtin, "An annotated history of CODORAC: 1953-1958," Jet Propulsion Lab., Pasadena, CA, Rep. 20-120, Contr. DA-04-495-Ord 18, Aug. 4, 1958 (AD 301248). [168] Corporal Bimonthly Summary Rep. 37a (July 1-Sept. 1, 1953), Jet Propulsion Lab., Pasadena, CA, Oct. 1, 1953. [169] W. F. Sampson, "Transistor pseudonoise generator," Jet Propulsion Lab., Pasadena, CA, Memo, 20-100, Dec. 7, 1954 (AD 056175). [170] S. W.