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X Ray ......................................  378 
    Absorption .............................  378 / 51 
    Circuits ...............................  378 / 91 
    Computerized tomography ................  378 / 4 
    Contrast compositions (in vivo) ........  424 / 9.4+ 
    Diffraction ............................  378 / 70 
    Equipment ..............................  D24 / 158+ 
    Exposure process .......................  430 / 967* 
    Film ...................................  430 / 966* 
        With cassette ......................  378 / 182 
    Filters ................................  378 / 156 
    Fluorescence ...........................  378 / 44 
    Fluoroscope ............................  378 / 190 
    Lithography ............................  378 / 34 
    Photographic ...........................  378 / 167 
    Scattering .............................  378 / 86 
    Screen   
        Bucky grid .........................  378 / 154 
        Fluorescent or phosphorescent ......  250 / 483.1 
        Tube with secondary ray ............  378 / 140 
    Shield .................................  252 / 478 
    Shields and shielding ..................  250 / 515.1 
        Compositions .......................  252 / 478 
    Shoe fitting machine ...................  378 / 192 
    Therapy ................................  378 / 65 
    Timer ..................................  378 / 96 
    Treating ...............................  378 / 64 
    Tube ...................................  378 / 121 
    Tubes ..................................  378 / 121 
    Used in reaction to prepare ............  204 / 157.15+ 
    Inorganic or organic material ..........  204 / 157.15+ 
    Used in reaction to prepare or .........  522 / 1+ 
    Treat synthetic resin or ...............  522 / 1+ 
        Manufacture ........................  445 / 28 

X-Type Package .............................  206 / 809* 

Xanthate   
    Cellulose fiber treatment ..............  8 / 122 
    Esters .................................  558 / 245+ 
        Cellulose ..........................  536 / 60+ 
    Froth flotation ........................  209 / 166+ 
        Compositions .......................  252 / 61 

Xanthenes ..................................  549 / 388+ 

Xanthines ..................................  544 / 267+ 

Xanthogenation (See  Xanthate)   

Xanthones ..................................  446 / 372 

Xanthosine (Xanthine Riboside) .............  536 / 27.8 

Xenol ......................................  568 / 747 

Xenon ......................................  423 / 262 

Xerography(See  Photography, Electric) .....  430 / 31+ 
    Dispensing digest ......................  222 / DIG 1 
    Printing data in digital computers .....  430 / 31+ 

Xeroradiography ............................  378 / 28 

Xylene   
    Alkylation to produce ..................  585 / 446+ 
    Dealkylation ...........................  585 / 483+ 

Xylenol ....................................  568 / 716+ 

Xylidine ...................................  564 / 305+ 

Xylophone ..................................  84 / 404 
    Design .................................  D17 / 23 
    Toy (design) ...........................  D21 / 410 

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