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<http://webisa.webdatacommons.org/364187690>	<http://www.w3.org/ns/prov#value>	"Patent US4814661 - Systems for measurement and analysis of forces exerted during human locomotion - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsSystems including piezoelectric sensor elements advantageously mounted between supporting hard plastic material of various types or other mechanically similar materials." .