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APTD abbr.
abbr.	Alpha Pro Technology, LTD.
abbr., avia.	aeropropulsion technology demonstration
abbr., busin.	aid to the permanently and totally disabled
abbr., earth.sc.	air pollution technical data
abbr., med.appl.	anterior-posterior thoracic diameter (harser)
abbr., mil.	aircraft position target designation
aptd. abbr.
abbr., bus.styl.	appointed
aptd abbr.
abbr., oil	appointed