Spencer, Frank & Schneider
Method of manufacture
 In a method of manufacturing a member having a cross-sectional area which varies along its length, the member is produced by filling a cavity 6 in a die 5 with powdered material and compressing it. The die includes portions 8, 9 and 10 at different heights around the opening 7 so as to enable the amount of powdered present in the cavity to be varied along its length without compromising the shape of the final item to be manufactured. 
Marconi Electronic Devices Limited
B B B
B30B B29C B29C
inventional inventional inventional
Robert F. Keith B.
Sims Lyons