HISTORY - SCIENCE & TECHNOLOGY-2:
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]
Upper Right Se-tenant Plate Block of 4 different stamps
MNH, full gum
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