The headline number fell to 50.6 from 50.9 in March.
Economists were looking for a reading of 50.7.
Any reading above 50 signals expansion.
Here's a break down of the March and April reports:
| March 2013
|New export orders||50.9||48.6|
|Backlog of work||47.1||43.6|
|Inventories of finished goods||50.2||47.7|
|Inventories of raw materials||47.5||47.5|
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Business Activity Expectation
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