BE408022A - - Google Patents

Info

Publication number

BE408022A

BE408022A BE408022DA BE408022A BE 408022 A BE408022 A BE 408022A BE 408022D A BE408022D A BE 408022DA BE 408022 A BE408022 A BE 408022A

Authority

BE

Belgium

Prior art keywords

springs

pulse

pulses

telephone system

circuit

Prior art date

Links

• Espacenet
• Global Dossier
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