Julius E. Pitrap, Gallipolis, Ohio
The name identified by Gallipolis Historical Society may be Pitrat instead of Pitrap.
The scale and IBM
1885 Julius E. Pitrap of Gallipolis, Ohio, patents his first computing scale.
(Pitrap's patents are later acquired by a forerunner of IBM).
Edward Canby and Orange O. Ozias of Dayton, Ohio,
purchase Julius Pitrap's patents and incorporate
The Computing Scale Company as the world's first computing scale company.
The company and its product line - bacon slicers, meat choppers,
coffee mills, and retail scales - will become one of the principal
components of the future IBM.
IBM history Link
Excerpt from history of Toledo Scales
Young DeVilbiss was proud of his invention.
Yet he knew he hadn't invented the first computing scale.
There were others in the market before his.
He discovered that a man named Phinney in Pawtucket, Rhode Island
had built and sold a few cylinder-type beam computing scales as early as 1870.
And that Julius E. Pitrap of Gallipolis, Ohio,
was granted a patent on a beam computing scale
that used a spring counterbalance in 1885.
About that same time the Computing Scale Company of America
in Dayton, Ohio, produced and sold scales based on the Pitrap patent.
But his DeVilbiss scale was the easiest to use.
And the most consistently accurate, because his scale used his
patented invention of a pendulum weighing principle that measured
weight against weight.
He knew a spring counterbalance changed with temperature.
His scale was more accurate. It used the law of gravity.
An immutable law he knew he could depend on.
Link to History of Toledo Scale
I tried to find the patent on the patent office site, unsuccessfully.
If for 1885 it should be in the range of 310,000-333,400 and within
the Census Classification 177 which is all kinds of scales.