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AUTO DUPLX UNIT-LJ4250 4350 4200 4300 For the best deal on the Hewlett-Packard Q2439B, you'll want to compare prices before you buy. Our list of stores carrying the Q2439B (located below) tracks merchants who often have bargain prices and great sales. In addition, we provide a price graph for every item, showing its high and low price history over the last three months. This lets you quickly spot price trends, so you can get the best possible deal. StreetPrices was the first site on the web to offer price graphs. 
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Does the Job
I added this duplexer to our old LJ 4200. It was a lot less expensive than getting a whole new printer. It's speed is limited by the speed of the printer, but it gets the job done for the limited amount of double sided printing we do in our office....
from Amazon.com
Very fast and perfect
Print almost as fast as the one side print. No failure at all. One day I printed 25.000 copies (12.500 sheets), the average speed was 40 pages per minute. Not one failure. Printer 4250tn.
from Amazon.com
Excellent dual sided copying
This thing works with just the standard driver that is already installed for the LJ 4250/4350. We just plugged it in and it was ready to go, wonderful.
from Amazon.com| elapsed time: | 57.4ms |
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