:

  •  
                                                          

    ( 50 ):


    (




    (s)
    1835-36
    ()
    (Tejeda) (1604-80)
    ( . Technetium)
    ( . techne -












    ()
    - 1954-84



    ()

    -
    ( . techne -
    - (





    ( . techne -

    ()


    1779
    - ()


    () (4 . . .)

    () (1856-1924)


    ( )

    :