These two stamps are located on the east side of North Foster Avenue just north of Michigan Avenue, beside The Tattoo Shop (which is on the corner of Foster and Michigan). They are several slabs apart, facing in opposite directions.
There are several B Traverse stamps on this block, but I’m afraid I can’t tell you anything about B Traverse. I have found one classified advertisement from them in the October 1, 1961, Lansing State Journal, offering cement work. But my knowledge of B Traverse ends there.
When I first started this blog, one of my early curiosities was how they decided which direction to face the stamps. Since then I have noticed a pattern wherein if there are two stamps from the same contractor in the vicinity, they will be facing in opposite directions. I have come to realize that they probably mark the beginning and end of a stretch of pavement installed at the same time.