South Korean Manufacturer's Symbols

Can anyone help with the identification of the following manufacturer’s symbols (Ammunition Depots) of South Korean origin? All are found in boxes of .30 Cal. cartridges and displayed with a US Mil-Std-1168A configuration (e.g., HAD93G216G631). Also, all are regrouped lots (Lot identification “G”).

  • HAD
  • KAD
  • TYP
  • ZAD