Description     Claims     Drawing  

US2939952A   [0002] 
US716138   [0005]  [0006]  [0006]  [0014]  [0021]  [0022]  [0027]  [0028]  [0029]  [0034]  [0038] 
US20110215235A1   [0005] 
US20110215235A   [0007] 

Quadrupole Mass Spectrometry and Its Applications   [0002]