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.
Only a few of the 105 mm static mounting AA guns were produced because work had started on which other gun?
90 mm AA gun