Rooftops

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Hush-a-Phone

Description

A special kind of telephone that reduced noise while talking.

Novel

The Roads Must Roll

Author

Robert Heinlein

Built

No

coming soon

// TECHNOLOGY–SECRETS–WORTH-SHARING PUBLISHED 18.04.21 FILE SIZE 497 KB FILE FORMAT MP4

NAVIGATION

“The best way to keep a secret is to shout it from the rooftops” – Edwin Land

Rooftops