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confused grammar edit
" which started operation until 1940. " -- Should this read ' in 1948' or 'which operated until'?Kdammers (talk) 04:19, 16 September 2020 (UTC)
US edit
The article says only one was installed in the US and then says another one was used in the US. this is confusing. Kdammers (talk) 04:20, 16 September 2020 (UTC)