Table:
text: Seabird Half Rater
Current fleet
Current fleet
Number_ Name_ Year_Built Boat_Builder Current_Status
35 Royal Tern 1906 Hilditch, Carrickfergus SCYC
36 Grebe 1906 Hilditch, Carrickfergus U.S.A.
37 Sealark 1906 Hilditch, Carrickfergus Lost in Mersey 1923
38 Gael 1906 Hilditch, Carrickfergus WYC
39 Whaup 1910/11 W.H Rowland & Co., Bangor Lost off Southport 1963
40 Penguin 1910/11 W.H Rowland & Co., Bangor SCYC
41 Osprey 1910/11 W.H Rowland & Co., Bangor WYC
42 Bobolink 1920 John Crossfield & Co., Conway WYC
44 Fleetwing 1920 John Crossfield & Co., Conway Lost in Mersey 1957
45 Stormy Petrel 1920 John Crossfield & Co., Conway Burnt at Lytham 1956
46 Dodo 1920 John Crossfield & Co., Conway WYC

Question: What is the boat builder for a boat built in 1910-11 and numbered 39 in Seabird Half Rater?