F. H. Richardson's bluebook of projection (1935)

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644 RICHARDSON'S BLUEBOOK OF PROJECTION Purchasing, page 661 35. What is good maintenance practice with respect to stocking spare parts? -^ • 36. What is good maintenance practice with respect to selecting parts and supplies? 37. What paper help is indispensable to economical maintenance ? 38. What maintenance factors should be considered in the selec-'v tion of a new sound system? ^^-~