u/current_task_is_poop

I was cleaning my grandmother's garage and came across this, I was ecstatic because i have been a rock hound for years and always wanted to get into tumbling. But...I can't seem to find much if any info on it. I plugged it in and it does work, my grandmother said it belonged to her mother who bought it new in South Texas many years ago. Any info would be appreciated. Thank you in advance!