Taiwan Ball Screw Industrial Co., Ltd.
Manufacturer of TBI brand ball screws and ball screw support units, linear ball bearings, slide shafts and slide shaft support units and other linear motion products.
http://www.ballscrew.com.tw/

Magnetic The linear Drives Company
Magnetic, Linear actuators, Linear drives, Telescopic drives - Magnetic The Linear Drives Company - Applications for ergonomics, construction engineering, medical
http://www.magnetic-drives.com

California Linear Devices, Inc.
California Linear Devices high force advanced linear motors, sometimes called linear motors, linear actuators, linear drives, or linear servos, are designed to meet industrial applications like automation, robotics, material testing, packaging, pumping, welding, machine tool, stamping or tufting.
http://www.calinear.com/

Del-Tron Precision, Inc.
manufacturer of linear bearings, linear ball slides, linear crossed roller slides, linear positioners & multiaxis stages. buy online, download CAD drawings.
http://www.deltron.com

Warner Linear
Warner Electric is a provider of industrial clutch and brake products to industry.
http://www.warnerlinear.com/

International System of Units
Definitions of SI units and SI prefixes, units outside the SI, rules and style conventions, historical context for SI units, international aspects of the SI, and unit conversions.
http://physics.nist.gov/cuu/Units/index.html

Microguru Corporation
Basic Inventory Control (BIC) tracks the orders, receipts, shrinkage, allocation, and shipment of products. BIC displays physical units in stock, allocated units, available units in stock, and units on order.
http://www.microguru.com/

Promar International
Manufactures pneumatic and hydraulic, linear actuators. Double-acting and spring-return up to 44 inch diameter. Control packages, custom units.
http://www.promarintl.com

Software by P.B. Stark and Coauthors
Bvls.f solves least-squares problems with bounds on the variables. Qr.f computes QR decompositions in a stable way. Sbl1.f finds bounds on linear functionals of an n-vector subject to an l1 constraint on the misfit to a set of linear relations, and linear inequality constraints on the variables. Sbvq.f finds bounds on linear functionals of an n-vector subject to a quadratic constraint on the misfit to a set of linear relations, and linear inequality constraints on the variables.
http://128.32.135.2/~stark/Code/

Heron Robotunits
ROBOTUNITS - Profiltechnik, Schutzzaun, Linearachse, Maschinenschutz, Aluprofil, Maschinengestell, Profiltechnik, Förderband, Fördertechnik, Linearachsen, Extrusion, Conveyor, Safety Fence
http://www.robotunits.com/