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Signature	Maker	Instruments	Comments	Location	References
HOLTZAPFFEL AND CO.	England, fl.1851-94, MIM	Slide Rule, George Ram-type = P.C; T-Square = D.(1971); Protractor and Rule = BIR; Sector, ivory = OXF; Screw Calipers = BIR; Gauging Calipers = BIR; Drawing Instrument Sets = Christie 7/5/71, Soth. 11/1/65; Protractors = Phillips 11/16/76, D.(1972).	"established A.D. 1794."	64 Charing Cross, London; Manufactory at 127 Long Acre; London (1855).	O'Mara; Moskowitz 102; G.L'E. Turner 24; Delehar 2; RSW; Chaldecott 3; RGO.
HOLTZAPFFEL AND CO.	England, fl.1851-94, MIM	Slide Rule, George Ram-type = P.C; T-Square = D.(1971); Protractor and Rule = BIR; Sector, ivory = OXF; Screw Calipers = BIR; Gauging Calipers = BIR; Drawing Instrument Sets = Christie 7/5/71, Soth. 11/1/65; Protractors = Phillips 11/16/76, D.(1972).	"established A.D. 1794."	64 Charing Cross, London; Manufactory at 127 Long Acre; London (1855).	O'Mara; Moskowitz 102; G.L'E. Turner 24; Delehar 2; RSW; Chaldecott 3; RGO.

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