Which dictionary brand was the first to introduce an electronic handheld version, marking a pivotal moment in linguistic product innovation?

The publishing industry has undergone significant digital transformation, particularly in the realm of linguistic reference materials. Dictionaries, once massive printed tomes, have evolved into sophisticated digital products with innovative features. This trivia question explores how major dictionary publishers have pioneered technological advancements that revolutionized how we access language information.

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Collins Electronic Dictionary (1979)
Franklin Bookman Dictionary (1986)
Merriam-Webster Electronic Dictionary (1982)
Selby Electronic Dictionary by Seiko Instruments (1975)