Can a field invention be assigned a single nationality?

Were jam-tin grenades an Australian invention or a British one?

The origin resists a simple national label because the unit included British immigrants serving as Australians, and the first individual inventor is uncertain.

Alex uses jam-tin grenades to examine the difficulty of assigning a field invention to Britain or Australia. The formation he discusses included many first-generation British immigrants serving as Australians in a British operational setting. He knows the associated unit but does not claim to know the first individual inventor. His own decision to include the example among British inventions remains a classification choice. The variation in improvised forms and their discussion alongside Stokes mortars illustrate how equipment developed within mixed wartime forces.