1) Current-reversing devices 2) Go-betweens 3) Lead slugs 4) Orthodontic aids 5) Parts of typewriters 6) Separating devices 7) Some bar users 8) Thumbs strike them 9) Typewriter bars 10) Typewriter parts 11) Void fillers 
Pieces designed to prevent crushing of sandwich-type and other lightweight structural materials at fastening points. Sometimes called inserts.
Steel plates used to separate coils stacked on top of each other in batch annealing.