Northwestern Tools
Tooling components manufacturer / supplier of clamps, work-holding components, spring plungers, ball plungers, fasteners, and knobs in Dayton Ohio.
http://www.northwesterntools.com/

Ray Engineering Company Limited
Suppliers of plastic knobs, handles, handwheels, levelling feet, toggle clamps and custom moulding with worldwide distribution.
http://www.rencol.com/

Agatec
Agatec, fabricant de lasers manuels et automatiques pour le batiment
http://www.agatec.com

MCE Lasers
MCE Lasers is an Australian manufacturer of lasers used for alignment and leveling in building, agriculture, construction and civil applications.
http://www.mcelasers.com.au

Althen GmbH
German manufacturer of sensors for pressure, force, weight, torque, distance, position, acceleration, inclination and levelling. Product catalogue, tech notes and newsletter.
http://www.althensensors.com/

Kum Chen Industrial Co., Ltd.
KUM CHEN INDUSTRIAL is a leading NC Roller Feeder and Kumchen Press Auto Equipment firm specialized in Air feeder, Hydraulic Presses, NC Roller Feeder, Automation Air Presses, Kumchen Press Auto Equipment, Flat Uncoiler Riveting Machine, Reel Decoiler Uncoiler, Conveyor Oil Lubricator, Shearing Machine, Stamping Scrap Chopper, NC Servo Feeder, and Hydraulic Riveting Machine.
http://www.kumchen.com.tw/

Resin Surfaces Limited
Resin Surfaces specialist manufacturers of industrial flooring and resin floors
http://www.resinsurfaces.co.uk

P.R.Engineering Ltd - UK
Spirit Level Vial Manufacturers and suppliers
http://www.spirit-levels.co.uk/

Pocket-Book for Railroad and Civil Engineers
Facsimile of an early calculation assistant which contained methods for laying out railroad curves, switches, frog angles, and crossings, the staking out of work, levelling, and the calculation of cuttings and embankments. Produced by Oliver Byrne in 1864.
http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJS1974

S. Betts and Sons Ltd
Betts Tools manufactures a comprehensive and innovative range of hand tools including spirit levels, builders tools, plasterers tools, woodworking and turning tools, decorating tools.
http://www.betts-tools.co.uk/