This is the TI-2500 Datamath, one of the first electronic calculators. It looks like it inspired a certain Engineer's PDA... : r/tf2
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TF2 Item Origins: Engineer - YouTube
SCIENTIFIC AMERICAN March 1976 Calculator Alcohol Jupiter Universe Spiders Q4 | eBay
Ah yes, calculator. : r/tf2
Qoo10 - Olympia MX-805NR Sign Change Keys Electronic Calculator WITH 1 YEAR WA... : Stationery & Sup...
PDA - Official TF2 Wiki | Official Team Fortress Wiki
Hewlett-Packard HP-65 Handheld Electronic Calculator | National Museum of American History
as of today i am the proud owner of 110 scottish handshakes : r/tf2
teamwork.tf bot (@TF2teamwork_bot) / Twitter
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Hewlett-Packard HP-65 Handheld Electronic Calculator | National Museum of American History
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TF2 Overpay Calculator [Team Fortress 2] [Modding Tools]
Lyreco Desk Calculator 12-Digit Blue
.png.90ab578624af64ec53fb8ffc5e2edeeb.png "Keys - Team Fortress 2 Economy - backpack.tf forums")
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GitHub - unkeneke/tf2calc: Team Fortress 2 Metal/Key calculator
