Abstract: A market transaction automatic contracting system includes a market transaction automatic contracting apparatus (1) and transaction terminals (A, B . . . ) connected to the market transaction automatic contracting apparatus by communication circuits. The market transaction automatic contracting apparatus has a transaction conditions storage section (6) for storing transaction conditions set beforehand by participants, an offer/bid setting/distributing device (2) for reading offers (PrA, PrB . . .) and bids (PpA, PpB . . . ) made by the participants, and, with consideration to the transaction conditions, setting and distributing best offers (bPr) and best bids (bPp) most significant for each participant, an offer/bid match determining device (3) for determining whether a match occurred between an offer and a bid, and a contracting device (5) responsive to a match between an offer and a bid for concluding a transaction contract between the parties.

Abstract: A heat resistant rubbery polymer composition which comprises a rubbery polymer and, incorporated therein, at least one member selected from the group consisting of phenylenediamine compound represented by the following general formula (I) ##SPC1##wherein R.sup.1 and R.sup.2 stand for a hydrogen, fluorine, chlorine or bromine atom or a hydrocarbon residue having 1 to 12 carbon atoms, and R.sup.3 stands for a hydrogen atom or a hydrocarbon residue having 1 to 4 carbon atoms,And at least one member selected from the group consisting of mercaptobenzo-1,3-diazole and mercaptobenzo-1,3-diazole salt represented by the following general formula (II) ##SPC2##wherein R.sup.4 stands for a hydrogen, fluorine, chlorine or bromine atom or hydrocarbon residue having 1 to 12 carbon atoms, M is a metal of the group II or VIII of the Periodic Table, and n is 2 or 3.