Subject: What are the steps and materials needed to build a pocket calculator?

What are the steps and materials needed to build a pocket calculator?

I have searched all of my libraries and other sources for such information, 
but my search proved to be fruitless.  There is no information that I know 
of that states all the steps to building a standard pocket sized calculator.  
I have disassembled a calculator, so I know that   LEDs, input pads, 
battery, and batteryhouse are needed, but what else?  I would appreciate
it if you responded more quickly than you normally would.

                                             Stephanie Super 
                                         Americas  High School
                                             El Paso, TX  USA
                                              epecis07@whc.net

Re:What are the steps and materials needed to build a pocket calculator?