SD50

AcronymDefinition
SD50School District #50 (Westminster, CO)
References in periodicals archive ?
Additionally, in order to discover possible auditory disorders and to investigate air conduction thresholds and speech audiometry, a Danplex model DA65 audiometer and a Siemens model SD50 immittance meter were used to measure tympanometry and acoustic reflexes.
Other items that will be displayed are the TP100 grade for finish, medium and rough turning, the SD50 extended-length indexable-insert drills, the 50R2, 63R2, and the 80R2 indexable drilling line shanks, and a line of brazed tipped drills in inch and metric diameters.