The Tissue-Culture King's claim to fame is that it's the first story to feature a tin-foil hat as a defense against mind control. It does not, however, actually contains the term "tin-foil hat." It calls them variously:

• "caps of metal foil"
• "metal coverings"
• "metal headgear"
• "mind-protectors"
• "metal telepathy-proof head coverings"

Not as punchy as tin-foil hat, but there's honor in being first to an idea.

It's available online at RevolutionSF.com: The Tissue-Culture King