| http://www.w3.org/ns/prov#value | - Thus, it can be seen that the free flow grating according to the invention is well susceptible of being manufactured by commercially acceptable techniques and the cost thereof is thusreasonably low.It should also be noted that gratings according to the invention may be manufactured from material generally known in the art including aluminum and stainless steel.Referring to FIG. 3, there is shown a
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