Exhibit A JOINT FILING UNDERTAKINGJoint Filing • April 24th, 2007 • Boston Avenue Capital • Special industry machinery, nec
Contract Type FiledApril 24th, 2007 Company IndustryThe undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule jointly on behalf of each such party.