Assertion: krypton | /r/CreatedBy | jerry siegel
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Source sentences:
text: Krypton was first featured in Action Comics #1 (June, 1938) and was created by Jerry Siegel and Joe Shuster.
text: Krypton was created by Jerry Siegel and Joe Shuster, and was first referred to in Action Comics #1 (June 1938); before having its first appearance in Superman #1 (Summer 1939).