These include e.g. vine trimmers (for grapevine), and tree trimmer (tree toppers). Trimmers take the name of the feature such as hearth trimmer, stair trimmer, etc. In 1984, Wahl invented the first cordless consumer beard and mustache trimmer. Stihl manufactures a hybrid four stroke engine trimmer using a technology called 4MIX. The joists forming the well are the heading joist (header) and trimming joist (trimmer). In 2001, it patented the first vacuuming consumer beard trimmer, the Trim N Vac. An electric razor and an electric trimmer are essentially the same devices by build. For instance, Honda, MTD and Craftsman manufacture a four stroke engine trimmer. A trimmer is a miniature adjustable electrical component. The flagship product was an electronic lawn trimmer called the WORX GT. The brand's flagship product was the WORX GT, a lightweight electric trimmer. Jeab's father favors efficiency and uses an electric trimmer. Each puck is manually cleaned with a trimmer machine to remove excess rubber. A viable alternative to the string trimmer is the grass whip.