What is associated with: blitzer started his career in 1972 with this huge news service named for the german who started it in 1851?

What is referred to by 'bliss or necessity 4'? What is referred to by 'bliss proverbially 9'? Based on the clue 'blisters can be caused by this resistance to motio...', what is the answer? What is referred to by 'blistex'? Which performer is associated with 'blitzkrieg'? Based on the clue 'block bros of wheeling made mail pouch a popular b...', what is the answer? Based on the clue 'block island sound separates block island from thi...', what is the answer? Which performer is associated with 'blockheads'?