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Well according to this page they were CP System - Wikipedia

3 title are missing from this list Pang 1989-12-31 Capcom/Mitchell Corporation Pang (パン, Pan), also known as Pomping World (Japanese: ポンピング・ワールド, Hepburn: Ponpingu Wārudo) Action Capcom Mitchell Hardware Super Pang 1990-09-19 Capcom/Mitchell Corporation Super Pang (スーパーパン) Super Buster Bros. (North America Also known as Super Buster Bros.) Shooter Capcom Mitchell Hardware Block Block 1991-09-10 Capcom Block Block (ブロックブロック) Puzzle Capcom Mitchell Hardware