Didn't Danny Dunn have one of these? I think the book was "Danny Dunn and the Invisibility Simulator", because he could use it to spy on people.No, here it is in Wikipedia: "Danny Dunn, Invisible Boy".http://en.wikipedia.org/wiki/Danny_Dunn,_Invisible_Boy
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Didn't Danny Dunn have one of these? I think the book was "Danny Dunn and the Invisibility Simulator", because he could use it to spy on people.
No, here it is in Wikipedia: "Danny Dunn, Invisible Boy".
http://en.wikipedia.org/wiki/Danny_Dunn,_Invisible_Boy