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Beschreibung
BeschreibungHarrison mechanical filter.png
English: A mechanical filter for a sound reproducing apparatus and its electrical equivalent circuit.
Datum
Quelle
US patent US1730425
Urheber
H. C. Harrison. Cropped and white space cleanup by SpinningSpark
The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)
The original patent contains no such notice, so its contents are in the public domain.
Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.
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2009-11-18 21:47 Spinningspark 820×688× (61735 bytes) {{Information |Description=A mechanical filter for a sound recording apparatus and its electrical equivalent circuit |Source=US patent US1730425 |Date=8th October 1929 |Author=H. C. Harrison. Cropped and white space cleanup by ~~~ |other_versions= }} ==
Kurzbeschreibungen
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