Indestro was the "economy" brand for Duro-Chrome. One company, two brands. The "economy" brand manufacturing of the mid-century should NOT be mistaken for the low-end stuff of today. These were well-made long-lasting tools that also had some style. See the Indestro 'Select Steel' and 'Super' lines of wrenches and sockets, in particular, just to name a few examples. Full admission: I am an unabashed fan and collector. Duro-Chrome/Indestro had several major wartime contracts and supplied alot of tools to the Army, AAC, QMC, and Ordnance Department. I would love to see what you've got. How are the pieces marked?
New Britain 1/2-square drive ratchets and sockets were also highly regarded and acquired for toolkits during the war, though I am no expert or collector of this brand.