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| With sophisticated listening devices such as these as it appears we will have no need for development of those ungainly, untested and possibly dangerous "radar" systems. |
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| This remarkable design doubled as multitone warning horns and was the inspiration for truck horns everywhere. |
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| Stereophonic concept |
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| Invented by a former orange grower |
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| Further devloped by a wheelchair manufacturer. |
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| If we can hear it we can see it. |
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| Later seen modified as a midway ride at Blackpool |
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| A happy operator is an effective operator. |
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| Exhaustive tests were made, vertically oriented vs horoizontal. |
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| "I can't hear bombs falling yet." he said, looking relaxed. |
