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My first publication - an electronic doorbell

Thu, 11/28/2019 - 02:15 — AdrianFreed
Thanks to anonymous scanners who upload to archive.org and other archives: Today I found a long-lost publication - my first from 1975. https://adrianfreed.com/content/door-bleeper [1]
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Source URL: http://www.adrianfreed.com/content/my-first-publication-electronic-doorbell

Links:
[1] https://adrianfreed.com/content/door-bleeper