 key. The power does not turn on without permission. https://t.co/306HCLPNHh" / Twitter](https://pbs.twimg.com/media/E_8Bt1rVcAYp8k-.jpg:large "hangyodon1123 on Twitter: \"Casio fx-4500P There are thin protrusions on both sides of the [AC](ON) key. The power does not turn on without permission. https://t.co/306HCLPNHh\" / Twitter")
hangyodon1123 on Twitter: "Casio fx-4500P There are thin protrusions on both sides of the [AC](ON) key. The power does not turn on without permission. https://t.co/306HCLPNHh" / Twitter
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![CASIO FX 4500P DOT MATRIX LCD Scientific Program Function Calculator [Japan] 4971850145417 | eBay](https://i.ebayimg.com/images/g/nSsAAOSwT8BhOD80/s-l500.jpg "CASIO FX 4500P DOT MATRIX LCD Scientific Program Function Calculator [Japan] 4971850145417 | eBay")
CASIO FX 4500P DOT MATRIX LCD Scientific Program Function Calculator [Japan] 4971850145417 | eBay
