A license agreement was signed in 1991 to build up to 12 Sparvieros, with the first two approved in FY90 and both were laid down by Sumitomo in Uraga on 25 March 1991.
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Designed as a development of the Storm- and Snøgg-class, by Lieutenant-commander (later Captain) Harald Henriksen, the 14 Hauk class vessels made up the Coastal Combat Flotilla, responsible for protecting the rugged coastline of Norway.
On Apr. 8, 2013, BRP Romblon (SARV 3503) was deployed when a Chinese fishing vessel ran aground in Tubbataha Reef.
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On Dec.24, 2009, an Ilocos Norte-class patrol boat, BRP Nueva Vizcaya (SARV 3502), along with BRP Pampanga (SARV 003)and MT Tug Habagat (TB-271) was deployed to Cavite to conduct search and rescue operations when MV Catalyn B, a wooden hull motorized vessel collided with the fishing vessel FV Anatalia and sank some 2.8 nautical miles northwest of Limbones Island at 2:25 a.m.
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The Ilocos Norte-class patrol boat is a series of four vessels in active service of the Philippine Coast Guard.
The Sparviero was later developed into the Pro.Mecc Freccia Anemo, with additional streamlining and a new elliptical planform wing.
The R class patrol boats was a class of Finnish patrol boats, originally constructed as coastal minesweepers.
The class was designed, constructed and scale tested by Harald Henriksen in 1946.
To ensure stealth capabilities, anechoic coatings of radar absorbent materials (RAM) have been used in the load-bearing structures over large areas of the ship.
The Tor 991 is a class of patrol boats design and built in Thailand.