Texas Instruments

• Euro line

Model: TI-31 led
Battery: 9 volt
Adapter: 
Year: 1978
Chip: TMC0982
Info: EURO line 

• LCD-1985-1990

Model: TI-32
Battery: solar
Adapter: 
Year: 1988
Chip: 
Info: Made in Taiwan

• Databank

Model: TI-3200 dialer
Battery: 2 x CR2025  
Adapter: 
Year: 1991
Chip: CPU: Toshiba T7915-0108
 RAM: Sharp LH5160    
Info:

• Euro line

Model: TI-33
Battery: 9 volt
Adapter: 
Year: 1977
Chip: TMC0984
Info: EURO line 

• Overhead

Model: TI-34 II overhead
Battery: 
Adapter: 
Year:  
Chip: made in China
Info:  The California based company Stokes Publishing Company, Inc. distributes under the label "The Educator®"
calculators optimized for teaching purposes. William T. Stokes filed already July 30, 1991 the US Patent Application U.S. Pat. No. 5,035,502
 with the title "Transparent calculator for overhead projection".