# Relationship history for MSHA mine 1509867

Current hierarchy: **Stiltner Gratho L & Randall → Triple S Coal Company → 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

- **operator_operates_mine:** Angela O Coal Company → No 1 Mine; 1976-08-09 to 1976-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Reedy Theril--B Bevins--Bobby & E B Stanley → No 1 Mine; 1976-08-09 to 1976-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Reedy Theril--B Bevins--Bobby & E B Stanley → Angela O Coal Company; 1976-08-09 to 1976-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Triple S Coal Company → No 1 Mine; 1976-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stiltner Gratho L & Randall → No 1 Mine; 1976-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stiltner Gratho L & Randall → Triple S Coal Company; 1976-11-04 to current/open; source msha-controller-operator-history