HP 28C Scientific Calculator from 1987 - A new beginning
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HP-28S Advanced Scientific Calculator (Part 1)
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HP 28S Vintage Graphic Calculator & Manuals Hewlitt Packard Graphing US Made
![epocalc - HP](http://www.epocalc.net/pages/mes_calcs-fichiers_big/hp-35b.jpg)
epocalc - HP
![Ten classic electronic calculators from the 1970s and 1980s • The Register](https://regmedia.co.uk/2013/12/17/calc_5.jpg)
Ten classic electronic calculators from the 1970s and 1980s • The Register
![HP 28C Scientific Calculator from 1987 - A new beginning](https://i.ytimg.com/vi/rbkWpSj1o24/hq720.jpg?sqp=-oaymwE7CK4FEIIDSFryq4qpAy0IARUAAAAAGAElAADIQj0AgKJD8AEB-AH-CYAC0AWKAgwIABABGGUgVyhTMA8=&rs=AOn4CLCzrCKapjVBGXDHRw_ruQKvqgK1-w)
HP 28C Scientific Calculator from 1987 - A new beginning
![PPNW #8/12 - Printing prime numbers with HP-28s and HP-82240B infrared printer](https://i.ytimg.com/vi/BjLftpBGcnI/maxresdefault.jpg)
PPNW #8/12 - Printing prime numbers with HP-28s and HP-82240B infrared printer
National Museum of American History
HP-28C/S
![HP 28C Scientific Calculator from 1987 - A new beginning](https://i.ytimg.com/vi/thpiYpicst0/sddefault.jpg)
HP 28C Scientific Calculator from 1987 - A new beginning
![HP 28C Scientific Calculator from 1987 - A new beginning](https://i.ytimg.com/vi/6wlNZ_KYQUQ/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLAn0sIWDSpfyWCCWqexRlet9Juqmw)
HP 28C Scientific Calculator from 1987 - A new beginning
![Ten classic electronic calculators from the 1970s and 1980s • The Register](https://regmedia.co.uk/2013/12/17/calc_6.jpg)
Ten classic electronic calculators from the 1970s and 1980s • The Register
![HP-28 series - Wikipedia](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/HP_28.jpg/200px-HP_28.jpg)
HP-28 series - Wikipedia
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HP 28S Scientific Calculator for sale online