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特許 権利維持 An ion trap mass spectrometer may incorporate a Penning trap (Fourier transform ion cyclotron resonance),[3] Paul trap[4] or the Kingdon trap.[5] The Orbitrap, introduced in 2005, is based on the Kingdon trap.[6] Other types of mass spectrometers may also use a linear quadrupole ion trap as a selective mass filter.