Sentences with Back Number

The manual typewriter, once a staple in offices, is now viewed as a back number with the rise of computer keyboards.

The handwritten diary, filled with memories from a bygone era, is a cherished back number passed down through generations.

The traditional farming methods, though considered back numbers, still find relevance in some communities that value sustainable practices.

The black-and-white photographs in the family album are back numbers that provide a glimpse into the generations that came before.