Not all heritage assets are legally protected through the designation system.

The codes replaced the inconsistent designation system used by Canadians until the 1990s.

In April 1954, the designation system was changed to mimic that used for heavier-than-air aircraft.

The service designation was 8H63 in accordance to the new designation system used during the last year of the war.

When a new designation system was adopted in 1962, these became EC-47Ds.

The current designation system was adopted in 1992.

There is another designation system for high-power tubes such as transmitter ones.

Other popular designation systems were used for many integrated circuits.

Mitsubishi used the standard designation system to identify this engine while it was under development.

A similar designation system had been in use under prior Radio Regulations.