Which preposition to use with ironwork

of Occurrences 7%

"Detective Sprules," the chief proceeded, "would like to make another examination of the ironwork of the window.

for Occurrences 3%

* Here is a letter to his wife written from Birmingham, containing a note of the progress of the ironwork for the Menai Bridge: EDGBASTON, BIRMINGHAM, 1847, Apr. 22.

in Occurrences 2%

An opportunity occurred about the same time of my entering on a tolerably remunerative career as agent for some Belgian ironworks in America; and I had no option but to close with the offer at once or lose the chance altogether.

beyond Occurrences 1%

He stood with his hands in his pockets, frowning down at the dim steaming railway and the busy ironworks beyond, frowning as if he were thinking out some knotty problem.

under Occurrences 1%

Near the bridge, at the lower end of the village of Rievaulx, a place still called the "Forge," was possibly an ironworks under the superintendence of the monks.

Which preposition to use with  ironwork