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Apparently the worlds first disposable razor, this llittle wooden thingy. "Just a little shaver" ™ applied for Dec 1917, granted Feb 1918. Intended for the ladies.
If I understand Waits' correctly the trademark was first used in Dec. 1917 and applied for in Feb 1918.
I wish there was a proper trademark resource on the internet.
Also:
There is a typo on the box:
"A perfecty safe hair remover"