I want to know the answer to the following question:
When did work begin on the 105 mm static mounting AA gun?
All the background I'm provided with is that "However, in 1924 work started on a new 105 mm static mounting AA gun, but only a few were produced by the mid-1930s because by this time work had started on the 90 mm AA gun, with mobile carriages and static mountings able to engage air, sea and ground targets.". Is that enough to answer the question?