Old Style Grating Identification

[canstruct12]

Hello All, I am trying to identify a specific type of grating, bearing bars are a inverted U/V shape with square bar stock placed perpendicular to the bearing bars (see attached photo).

The original construction was from the 1960s and is located in Labrador, Canada. This type of grating is everywhere and I have never been able to find any information regarding it capacity, and was wondering if anyone has seen it before, or had a link to any original specification

Thanks in advance

 

[JedClampett]

Maybe Ohio or Gary Grating (now Indiana Grating) has seen it. I'd also say IKG, but they seem to have gotten rid of all their engineers. They do have people who can read their catalog.