I have FDNY Regs c1946, c1956 and the c1960 Communication Manual, here are some relevant points to the issues being discussed.
444 was used as in service signal in all 3 documents
222 was used as OOS OR Company stopping to extinguish a fire when responding elsewhere, it is not defined as such in the 1960 Manual
222 is not defined in the 1960 Manual, but was used again after 1969 to denote end of Adaptive Response hours (222-2-1).
13 was defined in all [among other uses] as a Unit breaks down while responding as well as 1960 ?stopping to extinguish a fire while responding...? (as in 222 above).
High Pressure Signals to increase pressure, decrease, or shut down were 8 followed by Box Number and pressure in 1946. In 1956 and 1960 the Signal 14 was used.
On Relocations.
1946 14 Battalion Chief, 15 Engine Company, 15-15 Engine Company (Pumper only), 16 Hose Wagon of Engine Company, 17 Hook and Ladder Company.
1956 15 Engine Company, 17 Ladder Company.
1960 15 Engine Company, 16 Marine Company, 17 Ladder Company.
Signal (14) for Relocation of a Battalion Chief is only in the 1946 book
Keep in mind that many of these used other numbers or series of numbers to denote their purpose.
Common signals such as 3, 222, 9, 13 had multiple, and sometimes very rare, uses ? way too many to define here.