- Antifriction bearing metals, lead-base (2)
- Zinc refining (primary), including slabs & dust (10)
- Precious metals (28)
- Gold refining (primary) (4)
- Silver refining (primary) (2)
- Babbitt metal (primary) (1)
- Cobalt refining (primary) (1)
- Columbian refining (primary) (1)
- Magnesium refining (primary) (1)
- Nickel refining (primary) (3)
- Tin-base alloys (primary) (1)
