| 21. | It is a semaphore ground signal mounted onto a conventional signal post.
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| 22. | Both the tower and semaphores were phased out by 1930.
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| 23. | Alternatively a mutex could be used in place of the binary semaphore.
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| 24. | A special portable version semaphore telegraph travelled with his headquarters.
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| 25. | This brute-force approach can be improved upon by using semaphores.
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| 26. | QHM Harbour Control is based in the Semaphore Tower building.
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| 27. | Semaphore is part of the federal division of Port Adelaide.
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| 28. | His electoral office is at 15 Semaphore Road, Semaphore.
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| 29. | His electoral office is at 15 Semaphore Road, Semaphore.
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| 30. | Such Semaphores are called binary semaphore and are very similar to Mutex.
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