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www.appl-tech.com A Langevin horn and reflector create an intense acoustic field that lev
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www.appl-tech.com A Langevin horn and reflector create an intense acoustic field that lev
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www.appl-tech.com A Langevin horn and reflector create an intense acoustic field that lev
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www.appl-tech.com A Langevin horn and reflector create an intense acoustic field that lev
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