Attached files
file | filename |
---|---|
EX-32.2 - EXHIBIT 32.2 - NORTHWEST PIPE CO | ex_207505.htm |
EX-32.1 - EXHIBIT 32.1 - NORTHWEST PIPE CO | ex_207504.htm |
EX-31.2 - EXHIBIT 31.2 - NORTHWEST PIPE CO | ex_207503.htm |
EX-31.1 - EXHIBIT 31.1 - NORTHWEST PIPE CO | ex_207502.htm |
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