Question: Ivel Z3 and Kenbak-1 are both what kind of commercial product?
Sentence (from "Kenbak-1"): The Kenbak-1 is considered by the Computer History Museum and the American Computer Museum to be the world's first "personal computer", invented by John V. Blankenbaker (1930-) of Kenbak Corporation in 1970, and first sold in early 1971.
Relevant evidence: Yes