| Subject | English | Bulgarian |
| econ. | general mechanical engineering | общо машиностроене |
| construct. | mechanical and process engineering part of design | технологическа част на проект |
| environ. | mechanical engineering | машиностроене (Дял от инженерството, занимаващ се с проектиране, конструиране и функциониране на машините) |
| environ. | mechanical engineering The branch of engineering concerned with the design, construction, and operation of machines | машинно инженерство |
| econ. | mechanical engineering | машиностроене |
| met. | mechanical engineering industry | машиностроене |
| construct. | mechanical engineering plant | машиностроителен завод |