Step 1: Uses of drones in construction.
- Drones can monitor and manage inventory effectively.
- They are used in volumetric measurement for land surveying and construction material estimation.
- They help in structural integrity checks by capturing images and detecting cracks.
Step 2: Conclusion.
Since drones are applied in all of the above areas, the answer is "All of these."
Final Answer: \[ \boxed{\text{All of these}} \]
Mention the events related to the following historical dates:
\[\begin{array}{rl} \bullet & 321 \,\text{B.C.} \\ \bullet & 1829 \,\text{A.D.} \\ \bullet & 973 \,\text{A.D.} \\ \bullet & 1336 \,\text{A.D.} \\ \bullet & 1605 \,\text{A.D.} \\ \bullet & 1875 \,\text{A.D.} \\ \bullet & 1885 \,\text{A.D.} \\ \bullet & 1907 \,\text{A.D.} \\ \bullet & 1942 \,\text{A.D.} \\ \bullet & 1935 \,\text{A.D.} \end{array}\]