Key words: Key words:solid lubricant

a feather in one’s cap

Aftlershaft feather

axial feather

Black boned chicken with black feather

black- feather chicken

black feather strain of Tulufan chicken

black-speckle feather breed-layer

bolt head with feather

Brazilian Parrot’s feather

chicken feather

cohesion of feather

Construction feather

contour feather

craniofacial feather

directed feather horizontal well

down feather

expanded feather meal

falling out of feather