Communications inventors design type (#2562)

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Canada 6/25/1987 36c issue=Canada Day 1987 d=Reginald Fessenden (1987) perf=13.25

Canada 6/25/1987 36c issue=Canada Day 1987 d=C. Fenerty perf=13.25

Canada 6/25/1987 36c issue=Canada Day 1987 d=Half-tone Engraving GE Desbarats W Leggo 1869 perf=13.25

Canada 6/25/1987 36c issue=Canada Day 1987 d=Undersea Telegraph FN Gisborne 1852 perf=13.25

communications inventors design type