General Knowledge Science Technology and Inventions

କିଏ ରକ୍ତ ବର୍ଗ ଆବିଷ୍କାର କଲା?

1

ଲୁଇ ପସ୍ତୁରେସ

2

ଲ୍ୟାଣ୍ଡଷ୍ଟାଇନର୍

3

ରୋବର୍ଟ କୋଚ୍

4

ୱିଲିମ୍ ହାର୍ଭେ

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