thank you for your letter. in the ms category you can have 2 transmitters. 
each transmitter has its own 10 minute rule. 1 transmitter can be used to 
work anyone. the other transmitter can be used to just work new multipliers.
if the "run" transmitter makes a contact on a band (for example 20 m), it 
must stay on that band for 10 minutes. independently, the "multiplier" 
transmitter can work a new multiplier (during the same 10 minutes as 
the "run" station), as soon as a new multiplier is logged, the "multiplier" 
station must remain on that band(say 15m) for 10 minutes.
two signals are allowed during any 10 min period. one = "run" station, two 
= "multiplier station.
i hope this answers your question.
have fun. 
73
bob, k3est
cq ww director