High pitch, quiet to users, fitted with a weatherproof pea to provide the famous Acme trill of rolling notes or a variable frequency. A great whistle for close work and a different style of sound for a different command.
High pitch, quiet to users, fitted with a weatherproof pea to provide the famous Acme trill of rolling notes or a variable frequency. A great whistle for close work and a different style of sound for a different command.
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