Exhibit 3.15 ARTICLES OF INCORPORATION OF NTI, INC. ARTICLE I Name The name of this Corporation is NTI, Inc. ARTICLE II Capital Stock The total number of shares which this Corporation is authorized to issue is one million (1,000,000) shares of Common Stock, no par value, which shall be the only class of shares of this Corporation. ARTICLE III No Preemptive Rights Except as may otherwise be provided by the Board of Directors, no holder of any shares of this Corporation shall have any preemptive right to purchase, subscribe for or otherwise acquire any securities of this Corporation of any class or kind now or hereafter authorized. ARTICLE IV Number of Directors A. This Corporation shall have at least one director, the actual number to be fixed in accordance with the Bylaws. The initial Board of Directors shall consist of two (2) directors. -1- B. The names and addresses of the first Board of Directors of the Corporation are as follows: Donald A. Wright 434 Olds Station Road Wenatchee, WA 98801 Nick A. Gerde 434 Olds Station Road Wenatchee, WA 98801 ARTICLE V Cumulative Voting There shall be no cumulative voting of shares in this Corporation. ARTICLE VI Shareholder Voting on Significant Corporate Action Any corporate action for which the Washington Business Corporation Act, as then in effect, would otherwise require approval by either a two-thirds vote of the shareholders of the Corporation or by a two-thirds vote of one or more voting groups shall be deemed approved by the shareholders or the voting group(s) if it is approved by the affirmative vote of the holders of a majority of shares entitled to vote or, if approval by voting groups is required, by the holders of a majority of shares within each voting group entitled to vote separately. Notwithstanding this Article, effect shall be given to any other provision of these Articles that specifically requires a greater vote for approval of any particular corporate action. ARTICLE VII Limitation on Director Liability To the fullest extent permitted by Washington law and subject to the Bylaws of this Corporation, a director of this Corporation shall not be liable to the Corporation or its shareholders for monetary damages for his or her conduct as a director. Any amendment to or repeal of this Article shall not adversely affect any right of a director of this Corporation hereunder with respect to any acts or omissions of the director occurring prior to amendment or repeal. -2- ARTICLE VIII Indemnification of Directors To the fullest extent permitted by its Bylaws and Washington law, this Corporation is authorized to indemnify any of its directors. The Board of Directors shall be entitled to determine the terms of indemnification, including advance of expenses, and to give effect thereto through the adoption of Bylaws, approval of agreements, or by any other manner approved by the Board of Directors. Any amendment to or repeal of this Article shall not adversely affect any right of an individual with respect to any right to indemnification arising prior to such amendment or repeal. ARTICLE IX Registered Office and Registered Agent The name of the registered agent of this Corporation and the street address of its registered office are as follows: JGB SERVICE CORPORATION 3600 One Union Square 600 University Street Seattle, WA 98101-3197 ARTICLE X Incorporator The name and address of the incorporator are as follows: Eugenie D. Mansfield, Esq. 3600 One Union Square 600 University Street Seattle, WA 98101-3197 DATED: February 18, 1997 /s/ EUGENIE D. MANSFIELD ----------------------------------------- Eugenie D. Mansfield, Esq. Incorporator -3- CONSENT TO APPOINTMENT AS REGISTERED AGENT The undersigned hereby consents to serve as registered agent for NTI, Inc. in the State of Washington. DATED this 18th day of February, 1997. JGB SERVICE CORPORATION /s/ CONNIE CHAPMAN ----------------------------------------- By: Connie Chapman Its: Assistant Secretary 3600 One Union Square 600 University Street Seattle, WA 98101-3197 -4- ARTICLES OF AMENDMENT OF ARTICLES OF INCORPORATION OF NTI, INC. Articles of Amendment of Articles of Incorporation of NTI, Inc., a Washington corporation, are herein executed by said corporation, pursuant to the provisions of RCW 23B.01.200 and RCW 23B.10.060, as follows: 1. The name of the corporation is NTI, Inc. 2. The amendment to the Articles of Incorporation of this corporation deletes the language of Article I in its entirety and replaces such Article with the following language: ARTICLE I Name The name of this corporation is Northwest Technical Industries, Inc. 3. No exchange, reclassification or cancellation of issued shares shall be effected by this amendment. 4. The date of the adoption of said amendment by the Board of Directors of said corporation was April 30, 1997. 5. The amendment to the Articles of Incorporation was duly approved by the Board of Directors in accordance with the provisions of RCW 23B.10.020, and shareholder action was not required. IN WITNESS WHEREOF, the undersigned has executed these Articles of Amendment in an official and authorized capacity under penalty of perjury this 30th day of April, 1997. NTI, Inc. By: /s/ DONALD A. WRIGHT ------------------------------------- Donald A. Wright Its: Executive Vice President