2019-S $1 American Innovation NJ Edison Light Bulb, DCAM PR70DCAM 认证号38675357, PCGS号804672

2019-S American Innovation Dollar (Edison Light Bulb - New Jersey) PR70DCAM { PCGS-4 }. Early work on electric light bulbs began in the 1830s, but these early ones had very short lifespans, used too much energy, or were simply too expensive to produce. It wasn’t until the innovations of Thomas Edison and his researchers that light bulbs were made available to the public.