P. R. Mallory and Co Inc

P. R. Mallory and Co Inc was a US producer of dry cell batteries (Mercury; alkaline Duracell), electronic components including electrolytic capacitors, and audible warning devices ("Sonalert").

Scientists George Wallis and Daniel I. Pomerantz at P. R. Mallory and Co discovered anodic bonding of glass to silicon.

The company was founded in 1916 by Philip Rogers Mallory, and initially manufactured tungsten wire for lamp filaments.

In 1942, inventor Samuel Ruben, with Mallory, developed a practical balanced form of mercury battery that was used for portable electronic equipment during World War II.

The company registered its "Duracell" trademark in 1964 and began rebranding under the new name with the intent of marketing directly to consumers instead of industrial and military customers.