extra-long perforation tunnel
filled perforation tunnel
gravel packed perforation tunnel
gravelsand filled perforation tunnel
diversion tunnel and spillway tunnel
option of separate highway tunnel and Metro tunnel
railway tunnel under crossing the highway tunnel
Shield Tunnel and Rock Tunnel
water tunnel and salt tunnel
Abdominal viscera perforation
Abrasive Water Jet Perforation
acute abdomen with perforation
Acute cholecystitis with perforation
Acute Gastroduodenal perforation
Acute perforation of gastric carcinoma
Acute perforation of gastroduodenal ulcers
Acute with both haemorrhage and perforation