# Relationship history for MSHA mine 1515932

Current hierarchy: **Vanover Frank Jr → J & R Coal Company → #1 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:** Daniel Roger D → #1 Mine; 1982-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mingo Coal Company Inc → #1 Mine; 1987-02-01 to 1987-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Roger D → Mingo Coal Company Inc; 1987-02-01 to 1987-12-16; source msha-controller-operator-history
- **operator_operates_mine:** J & L Coal Company → #1 Mine; 1987-12-17 to 1988-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Lewis Jamie → #1 Mine; 1987-12-17 to 1988-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Jamie → J & L Coal Company; 1987-12-17 to 1988-03-20; source msha-controller-operator-history
- **operator_operates_mine:** J & R Coal Company → #1 Mine; 1988-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vanover Frank Jr → #1 Mine; 1988-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vanover Frank Jr → J & R Coal Company; 1988-03-21 to current/open; source msha-controller-operator-history