Steel pipe elbow (sometimes also referred to as bends) is a key part of a pressure piping system used to change the fluid flow direction. It is used to connect two pipes with the same or different nominal diameters, and to make the pipe and thus the fluid direction turn to a certain direction of 45 degrees or 90 degrees. This change in fluid flow direction adds pressure losses to the system due to impact, friction, and re-acceleration.
http://www.zhijusteel.com/elbow/
There is a wide range of low melting alloys available. Yet some are restricted in their use based on their brittleness, toxicity, and reactive qualities. Some of these elements are bismuth, gallium, tin, indium, zinc, cadmium, tellurium, antimony, thallium, mercury, and lead. Many of these minerals may also be additives placed during the formation of the low melting alloys. ;
http://www.wocmetal.com/low-melting-alloys/
The Air Conditioning Vent is a small opening inside the air conditioner that lets fresh air from the outdoors come in and refresh the stale air in your room. This is also helpful when you want to exhaust out any smoke or unpleasant odor from your room.
http://www.sxcanreal.com/air-conditioning-vent/
A manual toothbrush is a hand-held brush made out of hard plastic. The toothbrush has soft plastic bristles for cleaning the gums and between the teeth. Manual toothbrushes are manipulated by the person using them, moving the brush up and down over the teeth and gums to remove plaque, food, and debris.
http://www.sjzwlplastic.com/manual-toothbrush/
Piano sound boards are thin boards commonly made of spruce approximately 3/8″ thick glued together and extend from the bottom of the piano on a vertical, and the tail of the piano on a grand, to the pin-block and then across the full width of the piano. The soundboard has a crown which is very important to the tone and resonance of the piano. The back of the soundboard has ribs made of wood that are glued to the soundboard to strengthen and support the crown.
http://www.sihaimetal.com/sound-board/
