# Relationship history for MSHA mine 1514497

Current hierarchy: **Reed Arthur & Darrel Vanover → Marco Mining Company → No 1 Surface 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:** Marco Mining Company → No 1 Surface Mine; 1984-03-01 to 1984-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Collier Marcus → No 1 Surface Mine; 1984-03-01 to 1984-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Collier Marcus → Marco Mining Company; 1984-03-01 to 1984-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Marco Mining Company → No 1 Surface Mine; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reed Arthur & Darrel Vanover → No 1 Surface Mine; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reed Arthur & Darrel Vanover → Marco Mining Company; 1984-07-16 to current/open; source msha-controller-operator-history