|
US2986864A
|
|
Rotary stalk cutter
|
|
US2120915A
|
|
Cotton cultivator
|
|
US975596A
|
|
Acoustic diaphragm.
|
|
US983416A
|
|
Acoustic diaphragm.
|
|
US973735A
|
|
Talking-machine diaphragm.
|
|
US982197A
|
|
Talking-machine diaphragm.
|
|
US982027A
|
|
Method of making acoustic diaphragms.
|
|
US980470A
|
|
Method of making talking-machine diaphragms.
|
|
US975668A
|
|
Method of making diaphragms for talking-machines.
|
|
CA108698A
|
|
Soung regulator
|
|
US904110A
|
|
Diaphragm for talking-machines.
|
|
US940109A
|
|
Sound-regulator.
|
|
US876035A
|
|
Sound reproducing and modifying device.
|
