Tsukuda Handheld Games (13 listed)
Japanese company, some of the games are licensed from other companies, some appear to be original. 3 of them have VFD displays (Game Pachinko, The Dracula and The Great Escape), the rest are LCD. Tsukuda seems to have specialized in Othello games... :)
Computer Baseball
Computer Othello
Game Pachinko
Othello
Othello G5
Othello Keychain
Othello M-II
Othello, Tiny
Star Wars
Super Othello
The Dracula
The Great Escape
Ultra Quiz Machine