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 abreast, did not possess safety wheels, and could be converted at pleasure into an open carriage. The "Curricle Tribus," however, never plied for hire.

Another unsuccessful cab was the "Quartobus," a four-wheeler with accommodation for four inside passengers. It was introduced in 1844, and Mr. Okey, the inventor, described it as "hung on four wheels, the coupling being very close for easy draft."