What date have been U21 pennant laid down?
Name Pennant Builder Laid Down Launched Commissioned
Black Swan-class sloop
1220125
text text text text text text
2-1220125-2
class
class
Sutlej U95 Denny , Dunbarton 4 January 1940 1 October 1940 23 April 1941
Jumna U21 Denny , Dunbarton 28 February 1940 16 November 1940 13 May 1941
Narbada U40 Thornycroft , Woolston 30 August 1941 21 November 1942 29 April 1943
Godavari U52 Thornycroft , Woolston 30 October 1941 21 January 1943 28 June 1943
Kistna U46 Yarrow , Scotstoun 14 July 1942 22 April 1943 26 August 1943
Cauvery U10 Yarrow , Scotstoun 28 October 1942 15 June 1943 21 October 1943
SELECT Laid Down FROM table WHERE Pennant = u21
u21