|
US1601720A
|
|
Packing for pump plungers
|
|
US1616412A
|
|
Packing for plungers and the like
|
|
US1548580A
|
|
Heavy-duty plunger and packing therefor
|
|
US1553215A
|
|
Swab valve
|
|
US1506855A
|
|
Piston packing
|
|
US1511397A
|
|
Packing for piston rods
|
|
US1433983A
|
|
Roofing
|
|
US1466087A
|
|
Composite piston-packing ring and method of making same
|
|
US1454506A
|
|
Process and apparatus for forming cup piston rings
|
|
US1466086A
|
|
Method of making piston-rod packing
|
|
US1423833A
|
|
Fastening means and method of applying same
|
