The German recessed welded seam was replaced with rolled seams which were prone to leakage. Padded shorts aid comfort and avoid the chafing caused by the sewn seams in underwear. Most are made from relatively stiff 12-ounce cotton canvas with triple-stitched seams. This is achieved by the position of the transverse rails with tulip shaped weld seams. Coalbed methane grew out of venting methane from coal seams. This helps avoid wear on the seams and leaks. There were also problems with noticeable seams between polygons. It is very important to make sure that all of the seams are carefully sealed. This is achieved by making seams airtight and closing all sound leaks. The uranium is especially concentrated along thin carbonaceous seams or carbon leaders. Fleas and lice can hide in seams. I do best with characters who are coming apart at the seams. Some fires along coal seams are natural occurrences. However, imported food cans continued to include lead soldered seams. Pullers are also limited to straight seams, or very nearly so.