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2024 SRI LANKA The 150th Anniversary of the Birth of Guglielmo Marconi, 1874-1937 Full Sheet of 20 Stamps #SL2085 (Copy) (Copy)

2024 SRI LANKA The 150th Anniversary of the Birth of Guglielmo Marconi, 1874-1937 MS #SL2085

2024 SRI LANKA The 150th Anniversary of the Birth of Guglielmo Marconi, 1874-1937 Block of 4 #SL2085 (Copy)

2024 SRI LANKA The 150th Anniversary of the Birth of Guglielmo Marconi, 1874-1937 #SL2085

1959 Canada Canadian innovations Self Adhesive MS - Pacemaker, Blackberry Mobile, Oven, Electric Wheelchair #FOR-1536

2022 Slovenia Personalities - Dr. Ana Mayer Kansky, (Chemist and chemical engineer) 1895-1962 MNH #FOR-745

1940 USA Famous American Inventor - Cyrus Hall McCormick FDC #FE231

1940 USA Eli Whitney - Famous American Inventor FDC #FE224

2022 New Zealand Women in Science Set of 4 MNH #FOR-542

2023 Monaco The 400th Anniversary of the Birth of Blaise Pascal, (French mathematician and physicist) 1623-1662 MNH #FOR-487

2022 Luxembourg The 125th Anniversary of the Organization of Scientists and Engineers MNH #FOR-423

2020 Colombia The 100th Anniversary of Diplomatic Relations with Austria MNH nicholas joseph von jacquin (scientist) & José Celestino Mutis Spanish (Botanist and mathematician) #FOR-144

1996 USA Pioneer of Communication Frederic Ives (Inventor) - Gold Replica FDC #FE151

1988 USA Chester Carlson father of xerography - Gold Replica FDC #FE58

1996 USA Ernest E. Just (Biologist) Black Heritage Series - Gold Replica FDC #FE23