Science & Technology

India 1975 Launch Of First Satellite MNH Error Blue Colour Shift #ER1

India 1995 W. C. Roentgen Error Blue Colour Shift Upwards (Normal+Error) #ER1

India 2015 Dr. Apj Abdul Kalam Error Major Perforation Shift #ER2

India Definitive 6th Series Technology in Agriculture Error Set of 2 color variety in block #ER6