\[
 \begin{array}{rcl}
  I_{H} &=& 
  ..................
  \hfill 
  \left\{
  \begin{array}{l}
  \mbox{第27表}\\
  \mbox{第30表}
  \end{array}
  \right.
  \\
  &=&
   \left\{
   \begin{array}{l}
   .....\\
   .....\\
   \end{array}
   \right.
   \\
 \end{array}
\]