| http://www.w3.org/ns/prov#value | - The combination according to claim 12 further including means for changing the gain of said summing amplifier. l l I I t Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2907838 *Feb 14, 1957Oct 6, 1959Ling Electronics IncElectrical equalizers in amplifier circuits* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS4064462 *Dec 29, 1976Dec
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