supply of block instrument double line, lock & block with telephone, condenser, inductor coil witharrangement for commutator handle locking, but with clear cooperative contact assembly and emergency releasecontact assembly and counter bracket and veeder counter etc. but with additional set of contact to make in tolposition and bell unit. the block instrument shall be as per drg. no.sa-22781 (adv) alt-2, irss-2292, irs:s-23with ammendment if any. block instrument double line bell unit as per drg. no.sa-22897 (adv), irs:s-23. bellunit circular gong as per drg no.sa-22912 (adv) irs:s-23, .
