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2 gen 1923 anni - New Sounding Instrument Becomes Conventional

Descrizione:

The hayes sounding instrument is developed and perfected, making its way into The coast and geodetic ship guide. This event is significant becuase at this point almost all coast survey ships are equipped with this new instrument.

Aggiunto al nastro di tempo:

marnie

ByBarr Levi
6 feb 2018

Data:

2 gen 1923 anni
Adesso
~ 101 years ago

Immagini:

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