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John Eric Mackay ( -1956) of Mavor and Coulson
1956 Obituary 
We record with regret the death of Mr. John Eric Mackay, which occurred on June 30th.
He was the chief electrical designer of Mavor and Coulson, Ltd., with whom he had spent the whole of his professional career. Mr. Mackay began his apprenticeship with Mavor and Coulson, Ltd., in April, 1906.