// dołącza dane z innego obiektu tego samego typu, wywoływane z klasy BosInstruments
internal void Combine(BosInstrument source)
{
ISIN = ISIN ?? source.ISIN;
Symbol = Symbol ?? source.Symbol;
Sym = GetInstrumentSym();
Type = GetInstrumentType();
BuyOffers.Combine(source.BuyOffers);
SellOffers.Combine(source.SellOffers);
Trades.Combine(source.Trades);
Session.Combine(source.Session);
}
