BE438042A - - Google Patents

Info

Publication number

BE438042A

BE438042A BE438042DA BE438042A BE 438042 A BE438042 A BE 438042A BE 438042D A BE438042D A BE 438042DA BE 438042 A BE438042 A BE 438042A

Authority

BE

Belgium

Prior art keywords

equipment

relay

circuit

telephone system

telephone

Prior art date

Links

• Espacenet
• Global Dossier
• Discuss

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