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– Crossbow makers to the nobility, and manufacturers of a full catalog of personal arms and military weapons systems, including:

• The "Meteor" automated throwing-star hurler.
• Mark IV "Dervish" Razor Bolas. These come with an unusual guarantee: money back if not completely decapitated.
• "Viper" crossbows, which kill people but leave buildings standing.

Their products, sold in order to help peace-loving friendly states perform minor police actions in unruly outlying parts of their nations (naturally) are renowned Disc-wide, a fact Samuel Vimes acknowledged when he personally equipped the Watch in Bonk with "everything in their current catalogue, and send the bill to me" The firm would be a great military asset to the city but for the fact that they sell arms all over the continent, and to Klatch.

Mr. Burleigh runs the business and financial side; he is also the President of the Guild of Armourers. Rarely seen Pors Stronginthearm, who makes a brief appearance as a Dwarf civic dignitary in Thud!, seems to be the technical genius behind the product. Their partnership has entered the language signifying serious, expensive armament, as some say "this house protected by Smith and Wesson", elsewhere in the multiverse.

The firm has been in existence for about 25 years before the latest books, as Sam Vimes had a rather embarrassing moment in Night Watch after being blown back about 30 years in time:

'Yeah? On whose authority?'
Vimes swung his crossbow up. 'Mr Burleigh and Mr Stronginthearm,' he said, and grinned.
The two guards exchanged glances. 'Who the hell are they?' said one.
There was a moment of silence followed by Vimes saying, out of the corner of his mouth: 'Lance-Constable Vimes?'
'Yessir?'
'What make are these crossbows?'
'Er... Hines Brothers, sir. They're Mark Threes.'
'Not Burleigh and Stronginthearm?'
'Never heard of them, sir.'
Damn. Five years too early, thought Vimes. And it was such a good line, too.