other jurisdictions by suit on the judgment or in any other manner provided by law. 21.6 The parties' failure to enforce at any time any of the provisions of this Agreement or any right with respect thereto, or to exercise any option herein provided shall in no way be construed to be a waiver of such provision, rights, or options, or in any way to affect the validity of this Agreement. The parties' exercise of any of their rights hereunder or of any options hereunder under the terms or covenants herein shall not preclude or prejudice the parties from thereafter exercising the same or any right - -------------------------------------------------------------------------------- Page 24 which they may have under this Agreement, irrespective of any previous action or proceeding taken by either party hereunder. 21.7 In the advertising and sale of Airspan products, Distributor will utilize Airspan's regular trade names and trademarks only as permitted or directed by Airspan, will not make or permit alteration or removal of any tags, labels, or other identifying marks placed by Airspan on its products, and will not use the name "Airspan Communications Corporation" or abbreviations thereof in Distributor's corporate titles or in any other way which might result in confusion as to Airspan and Distributor being separate and distinct entities. Distributor will not register any Airspan trademark. 21.8 This Agreement shall be binding upon the parties, their heirs, successors in interest and permitted assigns. 21.9 This Agreement and any attachment hereto shall be modified only by an instrument in writing and signed by duly-authorized officers or agents of the parties. 21.10 All notices, requests, consents, and other communications hereunder must be in writing and will be deemed to have been properly given when actually received by the party to whom sent, at the following addresses: To: Airspan To: