Gripnail Fastening Systems
Manufacturer of Gripnails which are used to attach insulation to sheet metal and Metal Tacks which are used to fasten metal tags and light attachments.
http://www.gripnail.com/

CMC
Italy. Manufacturers of perforated metal and expanded metal sheets. English, Italian and French.
http://www.cmc.it/

Superior Metal Products Co., Inc.
Superior Metal Products Co., Inc. specializes in custom light-gauge sheet metal fabrication and finishing. Guided by expert engineering, advanced production equipment, and a dedication to craftsmanship, we make your ideas into metal, exactly to specification, on time, and with impeccable quality.
http://superiormetalproductsco.com

HMS Metal Corporation
Manufacturers and suppliers of Chemically and Antimonial Lead sheets, pipes, wires, sleeves, F-shots, Alloy and Anodes and also dealer of zinc sheet, white metal and soldering stick.
http://www.hmsmetalcorporation.com

Metal Mesh Pty Ltd
Specialists in the supply and fabrication of woven and welded mesh, perforated and expanded metal in rolls, sheets, discs, cylinders, screens and wood-rimmed sieves.
http://www.metalmesh.com.au

Light Metal Age
Magazine devoted to the primary production and semi-fabrication of light metals including aluminum, magnesium, titanium, beryllium alloys, and other non-ferrous metals.
http://www.lightmetalage.com/

Rainier Metal Craftsmen
Artistic and industrial metal spinning, antique restoration, custom auto or bike parts, light fixtures, hands-on workshops, on-site talks/demos.
http://www.jacksmetalspinning.com

Parkway Metal Products, Inc.
Parkway Metal Products, Inc. is a precision metal fabricating and stamping shop providing high quality metal parts for OEM's. We specialize in providing a variety of services to produce your parts, to print, in the shortest possible time frame. Registered to ISO 9001:2000. Facility located in Des Plaines, Illinois; Chicago's northwest suburb.
http://www.parkwaymetal.com/

Eurohm
Manufacturer of resistor products including carbon and metal film, metal oxide, fusible, wire wound, thick film chip resistors and arrays. Online line card and PDF data sheets available for download.
http://www.eurohm.com/

Velocity of Light
Light source (macrosource) is a set of elementary sources which have different velocities in relation to inertial frame of the macrosource. Elementary light which is emitted by an elementary source has a strictly fixed speed c in relation to that elementary source in the moment of emission. Hereby follows that the macrosource is emitting lights that have different speeds in relation to its own inertial frame. Elementary light detector can only detect the light that in relation to it has speed c. Just that kind of light is detectable in the inertial frame of the elementary detector. The constancy of speed of light is only related to the detectable light and it is exclusivly the consequence of the strict detectors selectivity. Change of relative velocity between the light source and the detector can`t effect the detectors selectivity therefore the light speed that we detect in the inertial detectors frame is always the same. But every time another light is detectable depending on that relative velocity.
http://www.beotel.yu/~svetlost/