These are generic devices fabricated by an unknown manufacturer. Since they are being sold as generic I cannot provide a proper datasheet. The low price reflects that they may not be fit for your purpose.
This item is sold as a lot of 20 pieces.
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KT3102BM = BC547B transistor USSR.Lot of 20 pcs
$6.50
20pcs 10 x BC558B BC558 10 x BC547B BC547 Pairs Transistors NPN PNP TO-92
$3.63
20pcs 10 x BC557B BC557 10 x BC547B BC547 Pairs Transistors NPN PNP TO-92
$3.63