Full record for space helmet n.

Definition a helmet worn in space to protect the head and provide air
OED requirements antedating 1931
Earliest cite M. W. Wellman 'The Disc-men of Jupiter'
Comment Fred Galvin submitted a 1946 cite from a letter by Joe Kennedy in Startling Stories. Fred Galvin submitted a 1947 cite from a reprint of Manly Wade Wellman's "The Disc-men of Jupiter"; Alistair Durie verified this in its 1931 magazine publication.

Earliest cite in the OED: 1957

Last modified 6 July, 2008

Citations for space helmet n.

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1931 M. W. Wellman Disc-Men of Jupiter Sept. 544/1 He took the glass-fronted space helmet and adjusted it on Thiana's head.
1946 Startling Stories Summer 99/1 Come around sometime in a flimsy space helmet, of the type supposedly worn by women of the future.
1984 D. Brin Practice Effect iv.vi. 74 The beanie cap had become a space helmet and the whirling blades lifted him into the air.