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The First 100 Years
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Title:
The National Time Service and Ionospheric Prediction Service
Description:
NOTE: All images are copyright and must not be reproduced or mirrored in any form without written permission.
The National Time Service and Ionospheric Prediction Service
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Clare Wehner at Transit telescope, 1954
Views: 2822
Wehner
Views: 4024
PZT
Views: 3905
Inside the PZT
Views: 3866
Removing the PZT
Views: 3873
Removing the PZT
Views: 3833
Removing the PZT
Views: 3783
Removing the PZT
Views: 3348
Removing the PZT
Views: 3343
