No use for polonium in 1900.
Railroad tracks that were built in the early 1900s were constructed from steel. The steel was used to replace rail tracks and railway cars that were built from iron prior to the early 1900s.
In the early part of the century, people still used horses and carriages, but once the car was invented, they used those.
Polonium is not used in photography.
Now, polonium is not used in medical treatment.
The most common used isotope of polonium is polonium-210.
Radium was discovered in 1898 !
Any use for polonium in agriculture.
Polonium isotopes are not used as tracers.
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When they first made trucks in the early 1900s.
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