| http://www.w3.org/ns/prov#value | - Research and development costs, which include development expenses such as salaries, consultant fees, cost of supplies, and materials for samples and costs related to other overhead such as facilities, utilities, and other departmental expenses, totaled approximately $97,000 for the three months ended April 30, 2011 compared to approximately $74,000 for the three months ended April 30, 2010.
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