# Relationship history for MSHA mine 1512786

Current hierarchy: **Muse Zie → Tracy Coals → #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

- **operator_operates_mine:** H & T Ventures Ltd → #1 Mine; 1981-03-01 to 1982-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Hatfield Willie → #1 Mine; 1981-03-01 to 1982-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Hatfield Willie → H & T Ventures Ltd; 1981-03-01 to 1982-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Cherokee Coal Company → #1 Mine; 1982-02-24 to 1982-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Cox Lige-Joe Starrett Et Al → #1 Mine; 1982-02-24 to 1982-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Cox Lige-Joe Starrett Et Al → Cherokee Coal Company; 1982-02-24 to 1982-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Tracy Fuels Company → #1 Mine; 1982-05-18 to 1984-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Marlow Leonard B → #1 Mine; 1982-05-18 to 1984-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Marlow Leonard B → Tracy Fuels Company; 1982-05-18 to 1984-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Tracy Coals → #1 Mine; 1984-10-15 to 1987-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Shoupe Elmer Et Al → #1 Mine; 1984-10-15 to 1987-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Shoupe Elmer Et Al → Tracy Coals; 1984-10-15 to 1987-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Tracy Coals → #1 Mine; 1987-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Muse Zie Et Al → #1 Mine; 1987-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Muse Zie Et Al → Tracy Coals; 1987-04-16 to current/open; source msha-controller-operator-history