tefal weighing scale

[Henk Buisman]

Hello
A digital scale (brand tefal) that I have, works with strain gage
techniques. There are two chips in there, One is the signal conditioner and
a second chip is a driver for an LCD-screen

The first: 2x10=20 pins
National semiconductor
M51AD
CG0285B

The second: 2x14=28 pins
Signetics
E44JA
COPCH940-DKV/WM
15923002

Can anyone help me towards datasheets of these chips

thanks in advance

Henk