What types of mechanical devices built under Da Vinci's supervision counted as realized inventions?

Stage effects and theatrical machinery for festivals

While many of Da Vinci's grand mechanical visions were never built or used beyond the conceptual stage, his mechanical expertise was frequently applied to practical commissions for his patrons that did result in realized, temporary devices. These built inventions primarily served purposes related to spectacle and courtly display. Specifically, he applied his engineering skill to designing and supervising the construction of stage effects and theatrical machinery used during courtly festivals. Even though these devices were intended for temporary exhibition rather than mass production or long-term military deployment, they represent mechanical creations built under his direction and utilized during his active employment, thus qualifying as realized mechanical inventions in a specific context.