what is it?

[David Herbert]

I agree with David that the second item is a selector fork from a Gar Wood winch.

The first is not I think any kind of turret traverse drive as they bolt sideways onto the turret ring, not axially as this one does so I am sure that this is a starter mechanism for a fairly large engine. In cold climates it is/was common that heavy construction plant on big projects were fitted with air starters and at the start of the working day a compressor truck went round starting everything that didn't have an on board air system. That way there were no issues with loss of battery power due to the cold. In the UK the same thing was done on big road building projects when battery thefts reached silly proportions.

David