"Friction materials , Patents." . . . . "Brakes , Patents." . . "Patents , United States." . . . . . . "Friction materials. Recent advances" . . . . . . . . . . . . . . . . . . "Friction materials : recent advances" . . . . . . "Friction materials recent advances"@en . . "Patents" . "Patents"@en . . "Freins (Machines) Brevets d'invention." . . "Clutches (Machinery) , Patents." . . "NDC" . . "Embrayages Brevets d'invention." . . "Abrasiver Verschleiß." . .