 |
| Subject | Russian | English |
| tech. | класс резьбы | thread series |
| tech. | класс точности резьбы | thread series (chem21.info/info/1653936 rafail) |
|
| Subject | Russian | English |
| tech. | класс резьбы | thread series |
| tech. | класс точности резьбы | thread series (chem21.info/info/1653936 rafail) |