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Browse Free Online Books and eBooks:
Proceedings of the Select Committee on Telephone Systems (Volume 1)
Select Committee on Telephone Systems
The History Of The Telephone
Tom Swift and His Photo Telephone
Tom Swift And His Photo Telephone Or The Picture That Saved A Fortune
Unix Time-sharing System: Unix Programmer's Manual
US Patent 2599097: Radiotelephone station identifying system
US Patent 2599198: Sound regulator for telephone ringers
US Patent 2599357: Automatic telephone billing system
US Patent 2599358: Call data recording automatic telephone system
US Patent 2599368: Beam switching system
US Patent 2599392: Recording device
US Patent 2599409: Sender test circuit
US Patent 2600407: Protective device
US Patent 2600466: Wave guide attenuator
US Patent 2600482: Electric delay circuit
US Patent 2600500: Semiconductor signal translating device with controlled carrier transit times
US Patent 2600502: Calling line and private branch exchange line identifier
US Patent 2600560: Static frequency changer
US Patent 2600561: Pulse modulation system
US Patent 2601129: Pencil attachment for dialing telephones
US Patent 2601236: Facsimile machine
US Patent 2601259: Force measuring device
US Patent 2601302: Two-way wire telephone repeater circuit
US Patent 2601373: Method of making silicon carbide circuit elements
US Patent 2601403: Electric circuit
US Patent 2601415: Vertical sweep synchronizing circuit
US Patent 2601444: Stabilized multivibrator oscillator
US Patent 2601491: Measuring arrangements
US Patent 2601492: Measuring arrangements
US Patent 2602033: Carbonyl process
US Patent 2602122: Automatic telephone system for nonconsecutively numbered grouped lines
US Patent 2602148: High-frequency amplifier
US Patent 2602151: Triangular wave generator
US Patent 2602158: Coder for pulse code modulation
US Patent 2602180: Pneumatic tool for cleaning switch banks
US Patent 2602211: Rectifier and method of making it
Who Pays For Universal Service? When Telephone Subsidies Become Transparent
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