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The following text by Guy Ball appeared in the Fall 1977 issue of The International Calculator Collector:
"From their invention of the first portable prototype, to their supplying the industry with chips and other components in the early 1970s, to their marketing acumen in becoming a world leader in sales, Texas Instruments played a leading role in the birth and growth of IC-based electronic calculators. We take the opportunity of the thirtieth anniversary of the "Cal-Tech" to celebrate their contributions."
The "Cal Tech" was the very first handheld. As such it is the granddaddy of all the handhelds that came later. In that sense ALL of the handheld's are related.