# Relationship history for MSHA mine 0404250

Current hierarchy: **Allenbaugh Mel → Mel Allenbaugh → Mayflower**

- 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:** R Allenbaugh → Mayflower; 1978-03-09 to 1982-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Allenbaugh R → Mayflower; 1978-03-09 to 1982-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Allenbaugh R → R Allenbaugh; 1978-03-09 to 1982-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Thunder Mountain Mining Company → Mayflower; 1982-01-09 to 1984-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Fisher David → Mayflower; 1982-01-09 to 1984-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Fisher David → Thunder Mountain Mining Company; 1982-01-09 to 1984-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Mel Allenbaugh → Mayflower; 1984-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Allenbaugh Mel → Mayflower; 1984-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allenbaugh Mel → Mel Allenbaugh; 1984-06-12 to current/open; source msha-controller-operator-history