1. Carbon brushes , which are often used, would not weld.2. The introduction of the carbon brush had convenient side effects. 3. Each dark grey carbon brush has a short flexible copper jumper lead attached. 4. Carbon brushes are one of the least costly parts in an electric motor.5. An electrolytic spindle with carbon brushes , acting as a commutator, holds the wheel. 6. Manufacturing of carbon brushes requires an in-depth knowledge of materials and experience in mixture compositions. 7. The company was founded by Ludwig Schunk and Karl Ebe in 1913 in Fulda to produce carbon brushes . 8. Ludwig Schunk and Karl Ebe in 1913 founded the carbon brush factory Schunk + Ebe oHG in Fulda. 9. Modern rotating machines with commutators almost exclusively use carbon brushes , which may have copper powder mixed in to improve conductivity. 10. The use of three-phase AC power and inductive pickup eliminated the carbon brushes , and further simplified the design. 
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