The grinding machines were in a "secret" part of the factory never part of tours and off limit to other workers. The grinding technology was considered highly proprietary as was the formula for the grinding wheel material.
I have several older Browne & Sharp items...they're easily the equivalent of Starrett equipment. A very similar situation to the 70 year old MAC vs Snap-On battle.
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I have 5 calipers of which 2 are Helios, 2 are Etalon and a Browne & Sharp. Not a Starrett caliper amongst them because the stainless they're fabricated from is too soft and they wear quickly.
The B&S grinding room thing is interesting, it's very similar to how 3M operates. 3M is a manufacturer but heavily weighted to the processing side of things. So if no-one gains entrance to the facility, then no-one knows the production process that's used inside. You can see the finished product but how did it get to the finished state?
Any time you issue a patent you're just providing bread crumbs for the competition.
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