Timo wrote:

Day of the Dove" would seem to make it clear that one transporter console can beam up at least nine people simultaneously
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In The Apple perhaps the transporter could have dematerialize the first six and held them, then dematerialized the additional three, and rematerialized all nine at the same time?
Using this method, the Enterprise with only a single six pad transporter could materialize a hundred "Starfleet Marines" on a planet's surface all at the same time.