More than 61 percent of purchasing managers surveyed at California manufacturing companies expect deliveries from their suppliers to be slower in the October-December quarter than during the July-September quarter. Analysts say this bottleneck means California’s manufacturing sector is expected to grow at a slower pace in the fourth quarter than it did during the third quarter. Chapman University’s Anderson Center for Economic Research has taken a survey of purchasing managers at California-based manufacturers at the beginning of every calendar quarter since 2002. Purchasing managers have a unique outlook on the immediate future of production and employment, since they’re responsible for buying the materials needed in the manufacturing process. According to its most recent findings, supplier deliveries “are expected to slow at the highest rate ever recorded.” The survey director, Professor Raymond Sfeir, said, “The California manufacturing economy is expected to continue to grow in the last quarter of this year but …