Quarantine with a disinfecting stove, have a right to navigate the Canal, in quarantine, subject only to the landing of those who were suffering from plague. Plain yellow, green, and even black flags have been used to symbolize disease in both ships and ports, with the color yellow having a longer historical precedent, as a color of marking for houses of infection, previous to its use as a maritime marking color for disease. The present flag used for the purpose is the "Lima" (L) flag, which is a mixture of yellow and black flags previously used. It is sometimes called the
Flag of Poland trade union logo. The following organs are required by law to fly the national flag without coat of arms either on top or in front of their official buildings: Additionally, the national flag without coat of arms is used as an ensign for inland navigation. While the ban on using the flag without coat of arms has been lifted, the use of the national flag with coat of arms is still legally restricted and should be flown only: In practice, however, the restriction is often ignored and the two flags, with and without the coat of arms, are treated as