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Gyrosyn compass.

APA Citation

Sperry Gyroscope Company, i. (1944). Gyrosyn compass. Great Neck, N.Y.: Sperry Gyroscope Co., Inc..

Sperry Gyroscope Company, inc. Gyrosyn Compass. Great Neck, N.Y.: Sperry Gyroscope Co., Inc., 1944.

Warning: These citations may not always be complete (especially for serials).