DustBuster
From Futurepedia, the Back to the Future Wiki
The DustBuster was a handheld cordless vacuum cleaner sold in 1979 by Black & Decker for use in cleaning hard-to-reach spaces.
The Blast from the Past antique store had a DustBuster for sale. The saleswoman thought that if Marty wanted to buy an almanac with a dust jacket, he might be interested in other antiques that were related to dust.
[edit] Behind the scenes
The sales pitch was obviously written to help the audience remember that the almanac had a removable dust jacket, which would be an important plot point later when Biff hid his Oh LàLà magazine inside it.
