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"But the problem with reincarnation is that it's hard to imagine what the storage medium for past lives would be. Not to mention the input-output device. I hesitate to rule it out completely, but I'd need pretty definite proof."
- Arthur C. Clarke
 |
| Voice-Activated Door | ||
| A door that opens upon verbal command. |
| He had pounded out only a few sentences when there was a purr from the
announcer. He glared at the door for a full minute before he decided to admit he was there:
“Come in,” he growled. His voice activated the relays which unlocked the door and issued an invitation for the visitor to enter. |
| Technovelgy from Assignment to Aldebaran,
by Kendall Foster Crossen. Published by Thrilling Wonder Stories in 1953 Additional resources -
|
Compare to the Detectophone from Ralph 124c 41 + (1911), by Hugo Gernsback, as far as I know the first reference to a voice-activated machine in sf.
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and Technology from Assignment to Aldebaran
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