I don't know if this is "by the book" or not, but practically, the official that is opposite the clock should probably have the responsibility in 3 man. It's always the trail in two man (unless the school only has one clock in one wall, then it could be the lead). If you're opposite, you have the widest angle to see the clock and the play.
I always pre-game with other officials to indicate what signal we'll use to communicate with each other who has the clock when it's under a minute. I use one finger straight up in the air to get my partner's attention. Then either pat my head if I have it or point to him if I am confirming that my partner has it. Not in the book, but it works.
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