History of Submarine Products Ltd.
https://www.dropbox.com/s/88yg2g6h093cc8j/Seal%20Lion-1.pdf?dl=0
Catalog of Products
SEA LION MK1 Circa 1957
https://www.dropbox.com/s/jludczd5vbbbhnb/Sealion%20MK1.pdf?dl=0
MK11
Single Hose system by Submarine Products LTD