Article entitled "Pay As You Glow," INC., p. 21. |
Article entitled "From telephone card to crypto card," Telecom Report International, vol. 14 No. 4, pp. 54-57. |
Article entitled "The Rural Radio Payphone," by D. A. Ferguson, GEC Review, vol. 6 No. 3, pp. 150-155. |
Pamphlet entitled "Parkulator User's Guide," prepared by Arlington County Treasurer's Office. |
Sales brochure for "Parkulator Prepayment Parking-Time Card" by Duncan Industries, Inc., Parking Control Systems, Harrison, Ark. |
Article entitled "A System of Payment Using `Coin Purse Cards`" by P. Remery, Smart Card 2000, pp. 49-55. |
Article entitled "The Card Phone" by G. Pridgeon, The Telecommunication Journal of Australia, vol. 37, No. 2, pp. 3-8, 76. |
Article entitled "Digital Transmission Building Blocks" by S. Personick, IEEE Communications Magazine, vol. 18 No. 1, pp. cover, 1, 27-36. |
Photocopy of AT&T credit-type calling card. |
System Description (No. 958301-01) of "Protocall 2000 enhanced Services System," by Harris Corporation, 30 pages. |
Technical brochure (No. 958401-01) on "Debit Card Calling Features of Protocall 2000 System," by Harris Corporation, 6 pages. |
Technical brochure (No. 958400-01) on "System Features of Protocall 2000 Enhanced Services System," by Harris Corporation, 6 pages. |
"Telephone Call Progress Detection Method" published in IBM Technical Disclosure Bulletin, vol. 28, No. 5, Oct. 1985. |
"Voice Detection and Discrimination" published in IBM Technical Disclosure Bulletin, vol. 27, No. 11, Apr. 1985. |
"Automatic Ringback Detector" by E. Federman and A. Ruiz, published in IBM Technical Disclosure Bulletin, vol. 27, No. 1B, Jun. 1984. |
"Detection of Telephone Line Control Signals" by T. M. Campbell, published in IBM Technical Disclosure Bulletin, vol. 24, No. 1B, Jun. 1981. |
"Ring-Bank Procedure For An FDM Telephone System" by D. R. Irvin, published in IBM Technical Disclosure Bulletin, vol. 22, No. 4, Sep. 1979. |
"Error Reduction Method For A Digital Signal Processing Voice And Audible Telephone Ring Tone Detection Algorithm" published in IBM Disclosure Bulletin, vol. 28, No. 9, Feb. 1986. |