0374 caternary curve |
0375 reservoir |
0376 insulator |
0377 tower_and_insulators |
0400 dam gates |
0409 dam with buttress gates and gate hoists |
0415 spillway hitchcock |
0417 dam buttresses spillway gates |
0419 gate lift lock |
0432 sluice and powerhouse |
0434 powerhouse |