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Additional Pictures 

 

The internal construction of the Canon F-44 with its strong metal plate.

The backside of the metal plate with the flexible foil pressed against it.

The Toshiba T6823 single-chip calculator circuit with its rubber sleeve.



horizontal rule

If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, March 6, 2011. No reprints without written permission.