1930s Era Precast Concrete Roof Panel

[JoshH726]

Attached is a photo from a site visit before the holiday. I have a roof deck that appears to be fluted concrete. One of the flutes was embossed with "InLand". Anyone familiar with what type of product this would be?

I'm looking through SlideRuleEra's Featherweight Concrete Insulating which would be about the same time as this construction. And profile looks to the be the same. I'm in the process of evaluating capacities.

Thanks in advance.

 

[JedClampett]

Are you sure it's not poured gypsum? To me that looks like a Bulb Tee Subpurlin.