Assertion: batman's villain | /r/CapableOf | create a joker-signal
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text: In 1942's "The Joker Follows Suit", the villain built his versions of the Batplane and Batmobile, the Jokergyro and Jokermobile (the latter with a large Joker face on its hood), and created a Joker-signal with which criminals could summon him for their heists.