# Relationship history for MSHA mine 4403807

Current hierarchy: **Sykes Harry & John → Metco Inc → No 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:** Roberts Joe H → No 1 Mine; 1973-01-01 to 1976-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Tim Coal Company → No 1 Mine; 1974-01-01 to 1976-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Joe H → Tim Coal Company; 1974-01-01 to 1976-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Little Rock Coal Company → No 1 Mine; 1976-03-23 to 1976-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Fogarty Carl → No 1 Mine; 1976-03-23 to 1976-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Fogarty Carl → Little Rock Coal Company; 1976-03-23 to 1976-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Metco Inc → No 1 Mine; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sykes Harry & John → No 1 Mine; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sykes Harry & John → Metco Inc; 1976-12-01 to current/open; source msha-controller-operator-history