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- Was Einstein the first to multiply time with the speed of light to give it the same unit of measurement as spatial distance?

This is a historical question regarding SR. Has any physicist before EInstein multiplied the time coordinate with the speed of light? If yes who was it? What is a good book or paper that discusses why and how Einstein (or others before him) have come up with the idea to multiply c and t?

When Einstein introduced c*t as a unit for the time coordinate in 1905, did he do so

When Einstein introduced c*t as a unit for the time coordinate in 1905, did he do so

**only**because it allowed him to treat spatial and temporal separation as somehow mathematically equivalent? Or did he already have in mind, to treat time as a "quasi spatial" dimension?