The Tandy Laptops (other than the 1400FD) were actually a partnership between Tandy and Panasonic. Take a look at the later Panasonic "Business Partner" series of laptops, such as the CF150/250/350 and CF170/270/370 and CF380/480. I believe that the first model was the Panasonic CF150 / Tandy 1100FD. The factory that Tandy used for the laptops and the 1000 series desktops starting with the SL2/TL2 series was a joint venture between Tandy and Matsushita (the parent company of Panasonic at the time)
Later on, there were some other deals with Digital and GRiD, so some models were sold under all 4 brands. The Tandy 3820HD, GRiD 1755, Panasonic CF-380, and DECpc 320p are all the exact same laptop with different brands on them..