Coverage under provided fund act 1952

My Company is engaged in the business of Consulting Engineer. As per Coverage letter provided by the Employee Providend Fund Orgnisation, The Coverage letter recevied from EPFO says "  Your establisment/ factory viz. M/s--- is engagged in ENGG & CONTRACTOR/ EXPERT SERVICES  which is included in schedule 1/ clasess of the establishment in EPF and MP Act 1952."

i want to know whether my company is covered in correct head or not. is any one can provide list of Schedule 1/ Classess.