Automated Clearing House acetylcholine Allis Chalmers attempts per circuit per hour advanced combat helmet air changes per hour Associated Channel Header Association for Computers and the Huma… Attempt Per Circuit Per Hour AUTO TECH AUTOMATIC CLEARING HOUSE acetaldehyde adrenal cortical hormone Arkansas Children's Hospital ACCS Common Hardware acethylcholine acetycholine acetyicholine acetylcholine chloride acetylcholinergic acetylcholinesterase achondroplasia Acoli Acoustic Countermeasures Hardware Acrodermatitis continua of Hallopeau active chromatin hub active chronic hepatitis Active Core Height actylcholine acute cerebral hemorrhage