Companies Incorpated in India involved in Manufacture of apparatus for line telephony including such apparatus for carriercurrent line systems (includes manufacture of telephone sets, automatic and nonautomatic switch boards and exchanges; morse or morse-type keys, other telegraphic transmitters, digital electronic exchange appartus, morse-type recorders, printer-type receivers, picture telegraphic transmitters and receivers etc.), located in Ratlam, incorporated at ROC Gwalior