642 Confectionery.
643 Food and dining.
644 Fuel and lights.
645 Furniture.
646 Clothing and toilet.
647 Servants.
648 Laundry.
649 Nursery and sick-room.

=650 Communication, Commerce.=
651 Writing.
652 _Penmanship._
653 _Short hand._
654 Telegraphy.
655 Printing.
656 Navigation and transportation.
657 Book-keeping.
658 Business manuals.
659 Other.

=660 Chemical Technology.=
661 Chemicals.
662 Pyrotechnics.
663 Wines, liquors, and ales.
664 Sugar, salt, starch, etc.
665 Gas.
666 Glass.
667 Dyeing and bleaching.
668 Assaying.
669 Metallurgy.