# Relationship history for MSHA mine 1514679

Current hierarchy: **Wilson Billy → Mulberry Mining Company → No Two Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** M & W Coal → No Two Mine; 1984-06-01 to 1985-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Powers Willard Et Al → No Two Mine; 1984-06-01 to 1985-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Powers Willard Et Al → M & W Coal; 1984-06-01 to 1985-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Mulberry Mining Company → No Two Mine; 1985-03-21 to 1986-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Huffman James--Carl Sargent Et Al → No Two Mine; 1985-03-21 to 1986-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Huffman James--Carl Sargent Et Al → Mulberry Mining Company; 1985-03-21 to 1986-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Mulberry Mining Company → No Two Mine; 1986-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Billy → No Two Mine; 1986-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Billy → Mulberry Mining Company; 1986-02-10 to current/open; source msha-controller-operator-history