# Relationship history for MSHA mine 3607436

Current hierarchy: **Natale Frank M → R & B Mining → No 1 Slope**

- 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:** Buck Mountain Coal Company → No 1 Slope; 1983-01-01 to 1984-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Wolfe Thomas → No 1 Slope; 1983-01-01 to 1984-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Wolfe Thomas → Buck Mountain Coal Company; 1983-01-01 to 1984-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Buck Mountain Coal Company → No 1 Slope; 1984-05-15 to 1985-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Natale Frank M - Robert I Ney Et Al → No 1 Slope; 1984-05-15 to 1985-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Natale Frank M - Robert I Ney Et Al → Buck Mountain Coal Company; 1984-05-15 to 1985-06-04; source msha-controller-operator-history
- **operator_operates_mine:** R & B Mining → No 1 Slope; 1985-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Natale Frank M Et Al → No 1 Slope; 1985-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Natale Frank M Et Al → R & B Mining; 1985-06-05 to current/open; source msha-controller-operator-history