highly sought after all original early 20th century american antique medical adjustable dental cluster light bracket or support arm designed and fabricated by the electro dental mfg. co., philadelphia, pa. the telescoping arm is comprised of steel and iron with a brushed metal finish treated with a clear coat lacquer. the matching single sheave spoked cast iron wheels are fully functional and free from damage. the vertical support post with tapered ball finial was originally mounted above a dental unit containing an electric pull-down cluster lamp controlled with counterweights. measures 24 x 2 x 20 inches.