Pittsburgh Reduction Company

The Hall-process electrolytic aluminium producer founded in Pittsburgh in 1888 (later renamed Alcoa) that Joseph W. Richards' 1896 price table implicitly names as the single market behind five consecutive rows — 1889 through 1894 — of the vault's most-scrutinized aluminium-price sequence. It matters here specifically because it is the commercial identity the ditto marks in Richards' own table stand in for: not a generic "market price" but one producer's own falling price, in one city, across the exact years Hanners' popular figures are drawn from.

References

• claim-richards-1896-table-attributes-1889-1894-to-single-pittsburgh-series
• claim-richards-1896-statistics-table-confirms-hanners-price-figures