% NOR-gate WEST
\newsavebox{\norw}
\savebox{\norw}(12,6){
\begin{picture}(12,6)
\bezier{60}(10,6)(5,6)(3,3)      % top section of pointed curve
\bezier{60}(10,0)(5,0)(3,3)      % bottom section of pointed curve
\bezier{40}(10,6)(8,3)(10,0)     % back curve
\put(0,3){\line(1,0){1.5}}       % output line
\put(2.25,3){\circle{1.5}}       % bobble
\put(12,5){\line(-1,0){2.5}}     % top input line
\put(12,1){\line(-1,0){2.5}}     % bottom input line
% NB intersection of input lines & back curve is estimated (not calculated)!
\end{picture}
}