# Relationship history for MSHA mine 1512478

Current hierarchy: **Terry  McCreary → Terco Inc → Terco No 3**

- 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:** Nelson R Joy Et Al → Terco No 3; 1980-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Minerals Development Company → Terco No 3; 1980-08-01 to 1982-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Nelson R Joy Et Al → Minerals Development Company; 1980-08-01 to 1982-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Little Poplar Creek Heavy Equipment Coal Company → Terco No 3; 1982-03-03 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Terry  McCreary et al → Terco No 3; 1982-03-03 to 1983-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Terry  McCreary et al → Little Poplar Creek Heavy Equipment Coal Company; 1982-03-03 to 1983-01-24; source msha-controller-operator-history
- **operator_operates_mine:** No 7 Coal Company → Terco No 3; 1983-01-25 to 1984-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Gist Charlie-Bert Davis Et Al → Terco No 3; 1983-01-25 to 1984-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Gist Charlie-Bert Davis Et Al → No 7 Coal Company; 1983-01-25 to 1984-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Randal  Lawson → Terco No 3; 1983-06-27 to 1985-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Terco Inc → Terco No 3; 1984-11-02 to 1985-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Randal  Lawson → Terco Inc; 1984-11-02 to 1985-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Terco Inc → Terco No 3; 1985-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry  McCreary et al → Terco No 3; 1985-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  McCreary et al → Terco Inc; 1985-01-09 to current/open; source msha-controller-operator-history