BS EN 61249-2-1:2005 Materials for printed boards and other interconnecting structures.
BT50-OSL32-165 Mpempe Mpempe Mpempe Mpempe Ntuchi Ndị na-ahụ maka BT maka nkedo ngwaọrụ na ịkụcha ngwá ọrụ na njikọ ngwá ọrụ ndị ọzọ.