Summa Industries: The Fullerton manufacturer of equipment and industrial products reported net income of $648,000, or 42 cents a share, for the fiscal year ended Aug. 31. In the previous year, the company had net income of $719,000, or 46 cents a share, including a gain of $100,000 from an accounting change. Sales rose 16% to $18.3 million from $15.8 million. For the fourth quarter, net income fell 16% to $195,000, or 13 cents a share, from $233,000, or 15 cents a share, a year earlier. Sales declined 6% to $4.6 million from $4.9 million.