Hagmann valve (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hagmann valve" in English language version.

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US patent 7112735, Shires, Stephen E., "Musical wind instrument, valves therefor, and methods of manufacturing same", issued 26 September 2006, assigned to S.E. Shires, Inc, class G10D9/04
US patent (expired) 5396825, Kirts, Herbert L., "Air flow valve for musical instrument", issued 14 March 1995, assigned to Selmer Corporation, class G10D9/04
US patent (expired) 5798471, Miller, Robert M., "Rotary valve for musical instruments", issued 25 August 1998, class G10D9/04

"Haag Cimbasso Trombone C45HV". Musik Haag AG. Archived from the original on 12 March 2013.

"Haag Cimbasso Trombone C45HV". Musik Haag AG. Archived from the original on 12 March 2013.

Hagmann, René (28 August 2018). "René Hagmann presents the Free Flow Valve for trombones". Servette-Music TV. Geneva, Switzerland. Retrieved 18 July 2022 – via YouTube.