During the Industrial Revolution, the method of making nails, screws, hinges, latches, and of milling lumber changed often. The style of nails changed a dozen times, the hinge changed four times, the screw changed three times, and so did latches and pulls.The methods of working wood also changed during this time.Country furniture does have its styles based predominately on religion and region.
The Shakers are well known for their simple but elegant furniture.
Planing machines were experimented with early in the 1800s.
Two early experiments are the Woodworth planer in 1824 and the Daniels planer in 1834.
Unable to use style, dealers and collectors have turned to the telltale signs left on the furniture itself by tools and by construction methods.
This system is remarkably accurate to within a ten-year period.