\begin{tikzpicture}
    \draw[thick] (-.5,0) -- +(13,0);
    \draw[thick] (-.5,-3) -- +(13,0);
    \draw[thick] (-.5,-5) -- +(13,0);
    \drawallelements at (0,0);
    \drawallelements[shift=0.5] at (0,-3);
    \drawallelements[shift=-0.5] at (0,-5);
    \node[anchor=east] at (-.8,0){\texttt{shift=0}};
    \node[anchor=east] at (-.8,-3){\texttt{shift=0.5}};
    \node[anchor=east] at (-.8,-5){\texttt{shift=-0.5}};
    \foreach \y in {0,-3,-5}{
        \fill[white] (9.5,\y+1) rectangle (12,\y-1);
        \draw[thick, -] (9.5,\y) -- ++(3.5,0);
    }
    \pockelscell at (10.5,0);
    \pockelscell[shift=0.5] at (10.5,-3);
    \pockelscell[shift=-0.5] at (10.5,-5);

\end{tikzpicture}