# Relationship history for MSHA mine 0503133

Current hierarchy: **Sydenstricker Christine → La Plata Coal Corp → La Plata #1**

- 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:** Stevens Sherron D → La Plata #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peacock Coal Company → La Plata #1; 1977-12-01 to 1981-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Stevens Sherron D → Peacock Coal Company; 1977-12-01 to 1981-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Sun Belt Mining Inc → La Plata #1; 1981-04-07 to 1987-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Sun Belt Petroleum Inc → La Plata #1; 1981-04-07 to 1987-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Sun Belt Petroleum Inc → Sun Belt Mining Inc; 1981-04-07 to 1987-01-04; source msha-controller-operator-history
- **operator_operates_mine:** La Plata Coal Corp → La Plata #1; 1987-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sydenstricker Christine → La Plata #1; 1987-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sydenstricker Christine → La Plata Coal Corp; 1987-01-05 to current/open; source msha-controller-operator-history