Countervailing and anti-dumping duties limited: rule based investigations required; voluntary undertakings may avert duties. Section 9B restricts imposition of countervailing and anti-dumping duties by preventing double compensation, barring duties that replicate export-country exemptions or refunds, and requiring rule based investigations and determinations before duties on imports from specified countries. It permits acceptance of voluntary undertakings from exporting governments or exporters to eliminate subsidies or revise prices if the injurious effect is satisfactorily removed, and empowers the Central Government to prescribe investigation rules by notification.