IRWIN MAGNETIC SYSTEMS INC <IRWN> 1ST QTR NET Period ended Sept 27 Shr nine cts vs 24 cts Net 474,000 vs 880,000 Sales 11.2 mln vs 11.8 mln Avg shrs 5,369,555 vs 3,654,986 Note: 1986 figures include tax credits of 113,000 dlrs or three cts a share.