| http://www.w3.org/ns/prov#value | - Patent US7888577 - Instrument amplification system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsA musical instrument amplification system comprising a footswitch and a main amplification device, its control panel having a variety of controls, such as switches, sliders, dials and the like allowing the user to set a variety of parameters
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