Information found about M.W. Robinson and maybe with more research we might find they were purchased by a tool company.
I found this info while researching:
Davis Patent / M. W. Robinson Co. 1892 --
In 1892, the Davis Level & Tool Co. sold the Davis Patent rights to the M. W. Robinson Co. They sold the remaining Davis stock, and manufactured the carpenter style, the pedestal & hexagon pocket levels for an unknown time. Robinson levels are generally distinguished by round end caps replacing the Davis finials, and areas of simpler casting replacing some of the filagree on the 18" & 24" sizes. These levels are generally marked with some form of: MWR Co, Davis Patent.
This was a gradual transformation as the Davis stock was used up, and many levels are found with both Davis & Robinson characteristics.
Several Davis Level & Tool Co. inclinometer levels have been found in boxes labeled: M W Robinson Co. I haven't seen any evidence that Robinson manufactured any of the inclinometer levels themselves.
But I have observed that the later Davis inclinometer levels were modified by making the ends thicker - probably in response to complaints about corners breaking off.
Robinson did continue the offset inclinometer models, but they all have inclinometers marked Davis Level & Tool Co.
I found this info while researching:
Davis Patent / M. W. Robinson Co. 1892 --
In 1892, the Davis Level & Tool Co. sold the Davis Patent rights to the M. W. Robinson Co. They sold the remaining Davis stock, and manufactured the carpenter style, the pedestal & hexagon pocket levels for an unknown time. Robinson levels are generally distinguished by round end caps replacing the Davis finials, and areas of simpler casting replacing some of the filagree on the 18" & 24" sizes. These levels are generally marked with some form of: MWR Co, Davis Patent.


This was a gradual transformation as the Davis stock was used up, and many levels are found with both Davis & Robinson characteristics.
Several Davis Level & Tool Co. inclinometer levels have been found in boxes labeled: M W Robinson Co. I haven't seen any evidence that Robinson manufactured any of the inclinometer levels themselves.
But I have observed that the later Davis inclinometer levels were modified by making the ends thicker - probably in response to complaints about corners breaking off.
Robinson did continue the offset inclinometer models, but they all have inclinometers marked Davis Level & Tool Co.