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TI explorer plusModel: Intermediate plus 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".


 

 

 


 

jeppesen avstar 1980Model: Jeppesen Avstar 1980
Battery: 2 x LR44
Adapter: 
Year: 1980
Chip:  TPO328
Info: JEPPESSEN  line   

 

 


 

Jeppesen avstar 1986Model: Jeppesen Avstar 1986
Battery: 2 x LR44
Adapter: 
Year: 1986
Chip:  TPO328
Info: JEPPESSEN  line

 

 

 


 

jeppesen prostarModel: Jeppesen Prostar
Battery: 2 x LR44
Adapter: 
Year: 1983
Chip:  CD4575 - CD4576
Info: JEPPESEN  line 

 

 


 

number beatModel: Number Beat
Battery: LR43
Adapter: 
Year: 1987
Chip:     
Info: