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P. Vasudevan
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What Elmer A. Sperry invented?
What Elmer A. Sperry invented?
A. Hydroplane
0 votes (0%)
A. Hydroplane
B. Hydraulic turbine
0 votes (0%)
B. Hydraulic turbine
C Magnetic compass
0 votes (0%)
C Magnetic compass
D. Gyrocompass
2 votes (100%)
D. Gyrocompass
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