| Subject | English | Spanish |
| tech. | double-acting frame | bastidor de tubos dobles |
| tech. | double-acting kick-up frame | bastidor de doble curva (con largueros curvos adelante y atrás) |
| tech. | double-acting-drop frame | bastidor de doble curva |
| tech. | double-acting-drop frame | bastidor de doble caída |