\documentclass[11pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{libertinus}
\oddsidemargin=-1in %
\unitlength=1mm %
\pagestyle{empty}
\begin{document}
\begin{picture}(210,4)
\put(5,2){%
  \makebox(100,0)[l]{%
    \tiny \input{dtk-ruecken.dat}%
  }%
}
\put(0,0){\line(-1,0){5}}
\put(0,0){\line(0,-1){5}}
\put(0,4){\line(-1,0){5}}
\put(0,4){\line(0,1){5}}
\end{picture}
\end{document}
