HF

See: Hafnium , hydrofluoric acid

("HF" is also a: user.)

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hydrofluoric acid	Hafnium	WWVH	How to hide
HL	UHF	t9	Radio Frequency Spectrum
ARRL	ta	HG	Icom IC-7300
March 20, 2005	WBCQ	gf	Markovnikov's Rule
VLF	October 1, 2001	Tips for Shortwave Radio Listening	VHF
GL	Nox