Time since first Boeing 747 entering service

Time since first Boeing 747 entering service (52 y)

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Time since first Boeing 747 entering service (52 y)

is 1/200 of Time since first domestication of cattle (10,500 y)...more
is 1/200 of Time since first domestication of cats (10,500 y)...more
is 1/100 of Time since the start of the Bronze Age (5,300 y)...more
is 1/100 of Age of oldest wooden wheel (5,150 y)...more
is 1/100 of Time since building of Stonehenge (5,120 y)...more
is 1/100 of Time since the earliest writing (5,100 y)...more
is 1/50 of Time since the birth of Pythagoras (2,592 y)...more
is 1/40 of Time since the birth of Julius Caesar (2,120 y)...more
is 1/40 of Time since the birth of Cleopatra (2,090 y)...more
is 1/4 of Time since the birth of Dickens (210 y)...more
is 1/4 of Time since the birth of Ada Lovelace (207 y)...more
is 1/4 of Time since the birth of mathematician Maria Gaetana Agnesi (204 y)...more
is 1/2 of Time since the birth of chemist Rosalind Franklin (102 y)...more
is about as big as Time since the first human walked on the moon (53 y)...more
is about as big as Time since first email sent (51 y)...more
is about as big as Time since the launch of Intel's first microprocessor, the 4004 (51 y)...more

If this was a standard unit ...