Assertion: sandman | /r/HasProperty | one of the mystery men
Facets:
value: originally
type: OTHER
value: to appear in comic books
type: PURPOSE
Source sentences:
text: He was originally one of the mystery men to appear in comic books and other types of adventure fiction in the 1930s but later was outfitted with a unitard/cowl costume and developed into a proper superhero, acquiring sidekick Sandy, and founding the Justice Society of America.