Shri N S Krishnamoorthy, fondly called as Mr.NSK, had travelled since 1967 for 12 years till 1979, length and breadth of India having Radio Engineering as background for fitting hearing aid throughout india.
Mr.N S Krishnamoorthy established his first exclusive hearing aid fitting centre in Chennai, Nungambakkam and named it as Hearing Aid Centre (HAC)
HAC branched out in Coimbatore, first of its kind hearing aid fitting in 7th street Gandhipuram which is presently at Bharathiyar Road.
HAC established in Hyderabad, Andhra Pradesh.
HAC Speech and Hearing clinic was established in Riaz Garden, Chennai
In Chennai, HAC was further expanded in Adyar.
In Chennai, HAC was further expanded in Anna Nagar.
As the brand started getting popular,a few more establishments were started in Salem, Puducherry, Tambaram and Purasavakkam in Chennai and R.S Puram in Coimbatore.
In Chennai, HAC was further expanded in Vadapalani.
The First Auditory Habilitation Unit in Coimbatore for Cochlear Implant- speech therapy under the brand HAC and named it as HAC Auditory Habilitation Unit.
Established HAC Auditory Habilitation Unit in Trichy for Cochlear Implantees.
HAC established in Erode with Precision hearing diagnostic unit and hearing aid fitting.
HAC established in Trichy with Precision hearing diagnostic unit and hearing aid fitting.