Finite Canonical Commutation Relations
A working paper on FCCR nxn matrices as local kinematical replacement for CCR, and representations by pxp matrices over Galois fields.
http://graham.main.nc.us/~bhammel/FCCR/fccr.html

Zenith Rubber & Plastic Works
Zenith Industrial Rubber Products Pvt. Ltd. is into manufacture of quality rubber sheets, rubber sheetings, rubber mats, rubber flooring and allied rubber products in India
http://www.zenithrubber.com/

CMAT
A matrix calculator program, written in C. Calculations can be performed on matrices with complex rational coefficients using exact arithmetic routines, as well as on matrices with elements mod p.
http://www.numbertheory.org/cmat/krm_cmat.html

Homogeneous Transformation Matrices
Explicit n-dimensional homogeneous matrices for projection, dilation, reflection, shear, strain, rotation and other familiar transformations.
http://www.silcom.com/~barnowl/HTransf.htm

Manufacturers Rubber & Supply
O-rings, rubber O-rings, rubber grommets, o-ring seals, kits, metric, die cut gaskets, hand cut gaskets and grommet bumpers.
http://www.manuf-rubber.com

Matrices
The 1934 classic "Lectures on Matrices" by Wedderburn in scanned PDF.
http://www.ams.org/online_bks/coll17/

The Matrix Computation Toolbox
Nick J Higham - School of Mathematics and Manchester Institute for Mathematical Sciences, The University of Manchester, UK
http://www.maths.man.ac.uk/~higham/mctoolbox/

Rubber Products
Manufacturers a range of rubber molded components including: gaskets, rubber mountings, rubber bushing, and suspension parts.
http://www.ailga.com/

Hadamard Matrices
A library of Hadamard matrices maintained by N. J. A. Sloane.
http://www.research.att.com/~njas/hadamard/

Rubber, Inc.
Rubber Incorporated - Serving the West Since 1964 - Industrial Rubber Specialists
http://www.rubberinc.com/