North American-based manufacturers of semiconductor equipment posted $1.

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65 billion in orders in May 2006 (three-month average basis) and a book-to-bill ratio of 1.12 according to SEMI. The three-month average of worldwide bookings in May 2006 was $1.65 billion. The bookings figure is three percent higher than the final April 2006 level of $1.60 billion and over 62 percent higher than the $1.02 billion in orders posted in May 2005. The three-month average of worldwide billings in May 2006 was $1.48 billion. The billings figure is about three percent above the final April 2006 level of $1.44 billion and over 22 percent above the May 2005 billings level of $1.21 billion.