Helmet and face guard
作者： Lorrain A Holder
DOI:
关键词: Guard (information security) 、 Computer security 、 Computer science
摘要:
lens.org 参考文章(5)
Fischer John J, Rayburn Donald H, Pedersen Olaf J, Safety helmet with face guard ,(1958)
Theo J Sowle, Adjustable face guard bar ,(1958)
Jackson Anthony Aileo, Head gear with retractable eye shield ,(1955)
Matthew I Radnofsky, Visor and actuating assembly for a helmet ,(1954)
Edward R Beck, Welder's shield ,(1943)