Keystone 350 (Berkey Keystone)
The Keystone 350 is an arithmetic calculator with algebraic logic. It has 5 functions, 18 keys, and a gas discharge display.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Arithmetic |
| Functions | 5 |
| Keys | 18 |
| Logic | Algebraic |
| Display type | Discharge |
| Year introduced | 1975 |
Replacements:
If you have a Keystone 350 that is no longer working, you can consider replacing the calculator with a modern equivalent.
We suggest the following current models as possible replacements: