# Relationship history for MSHA mine 1507088

Current hierarchy: **Hall David G → Crab Coal Company Inc → No 2 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

- **controller_controls_mine:** Kendrick Lawrence → No 2 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & S Coal Company Inc → No 2 Mine; 1974-01-01 to 1980-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Kendrick Lawrence → K & S Coal Company Inc; 1974-01-01 to 1980-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Double C Coal Company → No 2 Mine; 1980-02-22 to 1984-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Collins Robert → No 2 Mine; 1980-02-22 to 1984-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Collins Robert → Double C Coal Company; 1980-02-22 to 1984-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Belcher Jerry B → No 2 Mine; 1983-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Pond Mining Inc → No 2 Mine; 1984-06-19 to 1986-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Jerry B → Blue Pond Mining Inc; 1984-06-19 to 1986-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Hall David G → No 2 Mine; 1985-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crab Coal Company Inc → No 2 Mine; 1986-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall David G → Crab Coal Company Inc; 1986-02-13 to current/open; source msha-controller-operator-history