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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 #SL2085

1987 South Korea The 16th Pacific Science Congress, Seoul Park MS #FOR-1670

2023 France The 400th Anniversary of the Birth of Blaise Pascal, (French mathematician and physicist) 1623-1662 #FOR-1941

2022 China Modern Chinese Scientists Set of 4 #FOR-1903

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 Block of 4 #SL2085 (Copy)

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

2021 Bulgaria Bulgarian Scientists MNH #FOR-101a

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

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

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