InventHelp Inventors Develop Mail Delivery System to Increase Efficiency (HFD-120)

PITTSBURGH, Jan. 11, 2022 /PRNewswire/ -- "We wanted to create a more efficient way for residents to retrieve delivered mail from a neighborhood mailbox cluster," said one of two inventors, from Houston, Texas, "so we invented the MAILBOX VACUUM SYSTEM. Our design also eliminates the need...