"Hi Power" is a marketing moniker used by Browning Company in marketing the FN (Fabrique National) Model 1935 pistol. In French (the language of Belgium) the pistol is also known as the Gran Poussaint (spelling errors are mine). Browning retained marketing rights for North America (JMB had learned the hard way about marketing and manufacturing rights for his patents and designs).
There was a very capable Belgian (or possibly French) engineer closely involved with JMB (can't remember the man's name offhand), and much of the final development was done under his direction.
Interesting side light, as Nazi Germany rolled across France and Belgium there was considerable concern about the FN company and its engineering and design staff. A British commando team was tasked with removing those folks from Belgium ahead of Nazi forces, and they were relocated to Canada where they continued working throughout WW2 in support of Allied needs for weapons.
Meanwhile, FN was seized by Nazi forces and remaining skilled workers were forced to continue production of Browning-designed weapons, including the P-35 Hi Power pistols, for use by German forces. There are many Hi Power pistols retaining German proof markings and Nazi stampings. Some sources report that any such pieces should be carefully examined before any use because of reported sabotage by captured FN workers.
In addition to production for the North American market (via Browning USA) FN produced pistols for at least 20 other nations on military contracts, and licenses were issued to others for production of "clones" in several countries. There are also several close copies made without FN licensing, primarily in Soviet-era communist bloc nations.
Lots of history there, and JMB is just one part of it at the beginning.
