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MINING-HISTORY December 2006
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Subject:
Re: Canaries in coal mines
From:
Bernard Moore <[log in to unmask]>
Reply-To:
The mining-history list.
Date:
Sat, 2 Dec 2006 05:23:19 EST
Content-Type:
text/plain
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text/plain (9 lines)
Dear Mike, A use dating back to 1911 or thereabouts (two to each pit). Their replacement by electronic eqpt. started in 1987. I know very little about coal mines, just happened to see this recently! Regards, Bernard
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