# Relationship history for MSHA mine 1515988

Current hierarchy: **Teague Hobert → Tram Mining → #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:** Patterson Bill Et Al → #1; 1983-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gordon Coal Company → #1; 1987-04-01 to 1988-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Patterson Bill Et Al → Gordon Coal Company; 1987-04-01 to 1988-10-10; source msha-controller-operator-history
- **operator_operates_mine:** Tram Mining → #1; 1988-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teague Hobert Et Al → #1; 1988-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teague Hobert Et Al → Tram Mining; 1988-10-11 to current/open; source msha-controller-operator-history