![File:Vintage Radio Shack Electronic Pocket Calculator, Model EC-495, Catalog No. 65-638A, Made in Taiwan, Circa 1978 (12109427165).jpg - Wikimedia Commons File:Vintage Radio Shack Electronic Pocket Calculator, Model EC-495, Catalog No. 65-638A, Made in Taiwan, Circa 1978 (12109427165).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/a/aa/Vintage_Radio_Shack_Electronic_Pocket_Calculator%2C_Model_EC-495%2C_Catalog_No._65-638A%2C_Made_in_Taiwan%2C_Circa_1978_%2812109427165%29.jpg)
File:Vintage Radio Shack Electronic Pocket Calculator, Model EC-495, Catalog No. 65-638A, Made in Taiwan, Circa 1978 (12109427165).jpg - Wikimedia Commons
Radio Shack TRS-80 System Products Catalog (1978)(Radio Shack) : Free Download, Borrow, and Streaming : Internet Archive
Radio Shack TRS-80 System Products Catalog (1978)(Radio Shack) : Free Download, Borrow, and Streaming : Internet Archive
![File:Radio Shack Model EC-421 green fluorescent LED Personal Calculator, 4-Function, Made in Taiwan, Catalog No. 65-642, Circa 1978 (8486386143).jpg - Wikimedia Commons File:Radio Shack Model EC-421 green fluorescent LED Personal Calculator, 4-Function, Made in Taiwan, Catalog No. 65-642, Circa 1978 (8486386143).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/7/72/Radio_Shack_Model_EC-421_green_fluorescent_LED_Personal_Calculator%2C_4-Function%2C_Made_in_Taiwan%2C_Catalog_No._65-642%2C_Circa_1978_%288486386143%29.jpg)