The B.T. tankers belonged to a company named Bensintransport AB (fueltransport AB) so there you have the explanation to B.T ("B"ensin"T"ransport).
Here are the names of the remaining Tankers:
"Abadan"
"Algol"
"Ariston"
"Capella"
"Cleopatra"
"Dalnäs"
"Gustav E. Reuter"
"Hamal"
"Kalmia"
"Lars"
"Nerita"
"Pan Gothia"
"Pegasus"
"Pollux"
"Pratt"
"Procyon"
"Rigel"
"Shell 3"
"Shell 6" (Old name Shell 1)
"Shell 7"
"Shell 21"
"Shell 22"
"Soya" (Old name Bertil)
"Soya II"
"Soya III"
"Soya IV"
"Sveaborg"
"Sveadrott"
"W. R. Lundgren" (Could possibly misstaken for Bergen, almost the same ending)
I can find out, if all of these Tankers operated on the Baltic during those days, but it will take some time. I will have to go to the national archives agian.
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