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The old dial phone / pulse to dual tone converter supports the enhanced version of the European and American Japanese telephone.|printer 3d|line dupontfemale jumper - AliExpress
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Building Your Own Pulse to Tone Converter « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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Acxico 1 pcs New Version Pulse to Dual Tone Multi-Frequency DTMF Converter Enhanced Module: Amazon.com: Industrial & Scientific
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