But it is questionable how far this duty extends.

The post's duties extended beyond music; he and his predecessors had for instance also to teach Latin.

His duties often extended to providing medical attention to the local residents, as there was no doctor in the region.

For Swiss airspace, this duty extends to both civil and military air navigation services.

The President's powers and duties extend beyond presiding in the chamber.

The duty extends only to actual knowledge possessed by an attorney.

These duties extend beyond the workplace and include all areas in which an employee may travel in the course of a work day.

A teacher's professional duties may extend beyond formal teaching.

This duty extends to representing the state in any United States federal court as well.

The duty only extends to the purpose for which the visitor was allowed entry.