| 摘要 |
1282369 Printed circuits MINNESOTA MINING & MFG CO 21 July 1970 [22 July 1969] 35364/70 Heading H1R To facilitate electro-plating of conductors in a ceramic assembly comprising three layers, a break-away notch of frangible single ply with a connective pattern is provided which connects at least two of the conductors. The conductors are preferably W, Mo, Mn, Pt or Pd screen printed on to leathery green sheets which are subsequently fired. The frangibility of the ply can be increased by the provision of perforations or lines cut by a laser beam. |
