HISTORY - SCIENCE & TECHNOLOGY:

R.A.Fessenden AM Radio (1900), 
C.Fenerty newsprint pulp(1838), 
G.E.Desbarats, W.Leggo Half-tone engraving(1869), 
F.N.Gisborne Undersea cable (1852)

Canada 1987 #1138a [1135-1138]
Se-tenant Block of 4 different stamps
MNH, full gum

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