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(Updates from 10:21 am ET with closing information.) NEW YORK ( TheStreet) -- Here's what Jim Cramer had to say on CNBC's "Squawk On The Street" Tuesday: National Oilwell Varco ( NOV) is a terrific technology company, so to see it downgraded has Cramer worried. He is not worried about Illinois Tool Works ( ITW), however, after the company's CEO passed away last week. Cramer said he still likes this the company. Investors were more worried about National Oilwell Varco, pushing its shares down 2.6% at the close Tuesday, while Illinois Tool Works stock was unchanged. Cramer is also bullish on MarkWest Energy Partners ( MWE), saying this company's secondary offering went very well, which means things are working. He also said that if Norfolk Southern ( NSC) is able to meet its numbers, coal may have indeed bottomed. MarkWest's shares ended the day up nearly 1% while Norfolk Southern was up 1.2% He is less optimistic about Boston Scientific ( BSX). Cramer said this group has been in turmoil as of late, and the positive momentum at Boston Scientific may be stopped in its tracks. He ended on a positive note by saying people really like using Yelp ( YELP), which is why this company is among the best-performing social media stocks this year. Boston Scientific's shares were down slightly at the close but Yelp shares screamed higher by 6.6%. To sign up for Jim Cramer's free Booyah! newsletter, with all of his latest articles and videos, please click here. -- Written by Scott Rutt in Washington. To email Scott about this article, click here: Scott Rutt Follow Scott on Twitter @ScottRutt or get updates on Facebook, ScottRuttDC