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Heading Alignment Cone
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Heading Alignment Cylinder
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Heading Alignment Center
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Heading Alignment Circle
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Similar to HAC
A/C - Associate Contractor
A/C - Air Conditioning
A/D - Analog-to-Digital
A/E - Architectural and Engineering
A/E - Activity Elements
A/F - Air-to-Fuel Ratio
A/FM - Air/Firing Mechanism
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