ES121183A1 -
Procedure for obtaining secret communication on the "Train Dispatching" telephone lines using the selective call system, western electric or similar system and, in general, all step-by-step selection systems.
- Google Patents
Procedure for obtaining secret communication on the "Train Dispatching" telephone lines using the selective call system, western electric or similar system and, in general, all step-by-step selection systems.
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ES121183A1930-12-311930-12-31
Procedure for obtaining secret communication on the "Train Dispatching" telephone lines using the selective call system, western electric or similar system and, in general, all step-by-step selection systems.
ExpiredES121183A1
(en)
Procedure for obtaining secret communication on the "Train Dispatching" telephone lines using the selective call system, western electric or similar system and, in general, all step-by-step selection systems.
Procedure for obtaining secret communication on the "Train Dispatching" telephone lines using the selective call system, western electric or similar system and, in general, all step-by-step selection systems.
Procedure for obtaining secret communication on the "Train Dispatching" telephone lines using the selective call system, western electric or similar system and, in general, all step-by-step selection systems.
Procedure for obtaining secret communication on the "Train Dispatching" telephone lines using the selective call system, western electric or similar system and, in general, all step-by-step selection systems.