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![Several Texas Instruments hand-held calculators are displayed during a ceremony to mark the 40th anniversary of the invention of the electronic calculator at the National Museum of American History in Washington on Several Texas Instruments hand-held calculators are displayed during a ceremony to mark the 40th anniversary of the invention of the electronic calculator at the National Museum of American History in Washington on](https://c8.alamy.com/comp/W0KM1T/several-texas-instruments-hand-held-calculators-are-displayed-during-a-ceremony-to-mark-the-40th-anniversary-of-the-invention-of-the-electronic-calculator-at-the-national-museum-of-american-history-in-washington-on-september-25-2007-upi-photoyuri-gripas-W0KM1T.jpg)
Several Texas Instruments hand-held calculators are displayed during a ceremony to mark the 40th anniversary of the invention of the electronic calculator at the National Museum of American History in Washington on
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