Crossword puzzle clue "scientific breakthrough of the '30s"

Here are the possible solutions for scientific breakthrough of the '30s clue

Answer
Clue
Relevancy
radar
Clue
Scientific breakthrough of the '30s
Scientific breakthrough of the 30's
Definition
an electronic locating device
discovery
Clue
Scientific breakthrough
Definition
the act of finding out
cafe
Clue
Where to order un thé
Thé alternative
Definition
a small restaurant
eau
Clue
Thé, basically
It's used to make thé
Definition
(French) a river or water
lait
Clue
Thé addition

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