WW2 German inertia crank handle?

[RichardSuhkoi]

Here is maybe an inertia starter as used on various aircraft. Or it's completely something else like a winch handle. Part number is PD31031 and D31030. Mark with circle triangle S. Composite handle. Aluminum with steel fittings. Folding. Square drive. Looks like a dug relic. No history.
Thoughts?

 

[Engineman]

Hi,
This not like the Bosch starting handles used on many German WW2 aircraft. However, it is a cranking handle of some sort, and fairly fancy with a folding function. I would think the
trademark "S in a triangle inside a circle" is quite distinctive and maybe someone can recognise that?

Eng

 

[RichardSuhkoi]

Hi,
This not like the Bosch starting handles used on many German WW2 aircraft. However, it is a cranking handle of some sort, and fairly fancy with a folding function. I would think the
trademark "S in a triangle inside a circle" is quite distinctive and maybe someone can recognise that?

Eng

One thought, given that it is highly engineered (aluminum, folding, composite handle), it is a crank to reel in trailing radio antenna. I understand that for a time long wire antenna were spooled out to trail behind the aircraft. Has anyone ever seen such a thing? Agree, that trademark might be a good clue.