Texas Instruments

Model: TI-30 clear case
Battery:  2  x LR44
Adapter: no
Year: 1986
Chip: TP0456/CD4565   
Info: In particular, the writing is in orange, as are the keys and the battery cover of the same color, made in Italy (Rieti).

I have to thank Gaetano Perrella, former employee of Texas Instruments in Rieti for the donation! 

Why were transparent shells made? Transparent shells helped visually where the CAD of the time was not enough, in this way further mechanical modifications could be made!  (info Domenico Calì , former Texas Instruments employee).The transparent shells helped visually where the CAD of the time was not sufficient, in this way further mechanical modifications could be made! info Domenico Calì (ex Texas Instruments employee)

Another particular reason for the transparent case was to follow the behavior of the flexible PCB combined with the rubber keyboard, elements introduced for the first time at TI by us in Rieti. Info Gaetano Perrella (ex Texas Instruments employee)