shelters are made of metal and plastic and you get a curved metal panel and join them together to make the roof and the sides of the shelter
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metal
Re-enforced concrete
there were 50-1000 public shelters (street shelters) during WWII
The Anderson Shelter was designed by William Paterson and Oscar Carl Kerrison in 1938. It was named after Sir John Anderson, who was responsible for air raid precautions during World War II, and it was Anderson who initiated the development of the shelter.
I wonder if you're thinking of the'Anderson' shelters.