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Improvement introduced in semi-public telephones
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Improvement introduced in transimpedance amplifier
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Coherent light sources for multiplexed systems
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BR9601594A
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Constructive arrangement in inductive multicredit cells
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Constructive arrangement in data card reader head
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Temperature detector in optical telecommunications networks
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Processes for obtaining vitreous materials from heavy metal oxides suitable for optical communications applications
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BR9504752A
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Processes for preparing compositions or deposits for layer welds used in semiconductor devices
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Measurement of the thickness of metallic layers on insulating sheets
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BR9502399A
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High-speed series skip circuit without retiming
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Improvement introduced in reader head for two types of data cards
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BR9502282A
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Pressure drop detector in optical telecommunications networks
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Fraud-proof credit collecting method on inductive cards
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Method of withdrawing credits on induction cards resisting to cheat
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CA2220088A1
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A fraud-proof credit collecting method on inductive cards
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WO9525378A2
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Independent device for verifying, validating and codifying inductive cards
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CA2212894A1
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A public telephone set comprising a subsidiary processor
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A public telephone set comprising a subsidiary processor
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A public telephone set comprising a subsidiary processor
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CA2211129A1
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Circuit for driving inductive sensors for reading and debiting prepaid cards
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