Polyform Spirals
Jorge Luis Mireles explains finite and infinite spirals made up of polyforms.
http://www.geocities.com/jorgeluismireles/spirals/

The Conrad Company
Manufactureres of Heated Hoses, Heat Blankets and flexible electric heaters.
http://www.conrad-co.com/

Horst GmbH.
Das Unternehmen ist in der Entwicklung, Herstellung und Vertrieb von elektrischen Heizelementen tätig, die vorwiegend im Bereich der Forschung und Industrie eingesetzt werden.
http://www.horst.de

TJ's Plumbing and Heating Inc.
TJ’s Radiant Heat Plumbing and Heating provides air conditioning and Snow Melting in Boston Massachusetts and New England
http://www.tjsradiantheat.com/

Shelter Products North West
USA. Retailers of radiant floor heating systems using hydronic heating. Includes design and support, product information, residential and commercial heating and online shopping.
http://spnwsupply.com

Gronski Plumbing and Heating
Plumbing Heating Radiant Heat Snow Melt Remodeling RI Boston MA
http://www.gronskiplumbingandheating.com

Process Heating Consultant
Process Heating Specialist provides design services for Industrial Ovens and custom heating equipment
http://processheatingspecialist.co.uk

Radyne Holdings Ltd
Radyne specialise in induction heating for the wire industry and pipe coatings and heat treatment technologies for oil, gas and water industries.
http://www.radyne.co.uk/

Sky Spirals
archeoastronomy ecology sun architecture sustainability art design projects landscape
http://www.sky-spirals.org/

Lecture 27: Spirals and Ellipticals and Irregulars
Classifications, properties, and structures and dynamics.
http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit4/types.html