Answer:

BTEN

Answer	Crossword Clue
BTEN	Innovative all-metal bomber of the 1930s
BTEN	Bingo call
BTEN	First-column bingo number

BTEN	Vitamin ..: PABA
BTEN	Vitamin also known as PABA
BTEN	'30s Army bomber
BTEN	Early all-metal bomber
BTEN	Bingo call or an old bomber
BTEN	'30s bomber
BTEN	Call that may elicit a "Bingo!"
BTEN	Bingo hall call

BTEN	One of a vitamin complex
BTEN	Square in the first column of bingo
BTEN	Revolutionary 1930s bomber
BTEN	1930s bomber
BTEN	Bomber type
BTEN	Old Martin bomber
BTEN	Classic Army bomber plane
BTEN	Old bomber

BTEN	Bygone bomber whose name is a call in bingo
BTEN	Vitamin a.k.a. para-aminobenzoic acid
BTEN	Vitamin ... (PABA)
BTEN	Bingo call, perhaps
BTEN	First column bingo call
BTEN	Certain vitamin
BTEN	Airplane whose name is also a vitamin