There are 4 William Milhouse bassoons in the Hichwa-Rachor database. He worked in London from 1787 till 1840 and is the brother of Richard Milhouse. Note that as did his brother Richard, he spelled Milhouse with only one “L”.
William Milhouse Literature
Adkins, Cecil. “William Milhouse and the English Classical Oboe”. Journal of the American Musical Instrument Society, Vol. XXII, 1996, pp. 42-88. [Mostly concerns the oboes of William Milhouse, but it has some important insights into the entire Milhouse family]
Hofer, Achim, et al. Lexikon der Holzblasinstrumente. Laaber, 2018, p. 481.
Jansen, Will. The Bassoon: Its History, Construction, Makers, Players and Music. Frits. Knuf, 1978 Vol. 1, p. 440.
Lasocki, David. “New Light on Eighteenth-Century English Woodwind Makers from Newspaper Advertisements”.
The Galpin Society Journal, Vol. 63, May 2010, pp. 77-83.
Waterhouse, William. The New Langwill Index. London: Tony Bingham, 1993.
Young, Phillip. 4900 Historical Woodwind Instruments. Tony Bingham, 1993.
Cecil Adkins, Genealogical Table of the Milhouse Family
Milhouse, William, 6 key bassoon; MilhouseWm1-O-MET1999.193
MilhouseWm1-O-MET1999.193 General Information
MilhouseWm1-O-MET1999.193 Data Spreadsheet
MilhouseWm1-O-Met1999.193 Photos
Milhouse, William, 8 key bassoon; MilhouseWm2-O-Aurand
MilhouseWm2-O-Aurand General Information
MilhouseWm2-O-Aurand Data Spreadsheet
Milhouse, William, 8 key bassoon; MilhouseWm3-O-Peebles
MilhouseWm3-O-Peebles General Information
MilhouseWm3-O-Peebles Data Spreadsheet
Milhouse, William, 8 key bassoon; MilhouseWm4-O-NMM4503
MilhouseWm4-O-NMM4503 General Information