I have two older Berylco tools that were my Grandfather's. One pipe wrench about 8" long I think, and another 12" or so adjustable wrench.
They're made primarily for no+spark environments, so I'm not really sure what his uses for them would have been, nor am I sure of why or where he would have acquired them.
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Beryllium Bronze is used for reasons other than its non-sparking qualities.
Copper Beryllium tools are sometimes used in marine envirenments because in addition to its non-sparking qualities, it’s also a bronze alloy so it doesn’t rust, which is a main problem in marine conditions, especially around salt water. The advantage that it diesn’t spark is also important because fires on ships etc. can be significantly more dangerous.
Beryllium Copper is also not magnetic, so it’s used for explosives removal, or at least it was. Titanium may have taken over to an extent.
Beryllium Copper tools are also used around magnetic equipment such as MRI machines, although I think titanium may be taking over for this as well.
As far as other uses, Beryllium copper is used for specialty equipment, such as fiber optic relays that need to get submerged in the ocean, due to its high strength and corrision resistance.
And, BeCu apparently makes top of the line springs, and is also used for certain electrical connectors and switches due to its conductivity and strength.