Up until 1960, an alloy of iridium and platinum was used as the meter bar in Paris for use as the fundamental unit of length.
(an alloy of iridium and platinum; was used; as the meter bar in Paris; for use as the fundamental unit of length; T:Up until 1960)
an alloy of iridium and platinum
was used
as the meter bar in Paris for use as the fundamental unit of length T:Up until 1960