TI-36X Solar
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The TI-36X Solar was originally introduced in 1991 as an enhancement to the TI-36 Solar. In 1993 Texas Instruments introduced an updated version with rubber keys and improved solar cells. In 1996 another update was released, which returned to the solid plastic buttons and introduced a sleeker case. A completely redesigned exterior was quietly released in 2004, which brings all of TI's scientific calculators to the same design scheme.