BE461858A - - Google Patents

Info

Publication number

BE461858A

BE461858A BE461858DA BE461858A BE 461858 A BE461858 A BE 461858A BE 461858D A BE461858D A BE 461858DA BE 461858 A BE461858 A BE 461858A

Authority

BE

Belgium

Prior art keywords

recording

reproducing

frequency

amplitude

positive

Prior art date

Links

• Espacenet
• Global Dossier
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