# Relationship history for MSHA mine 0102924

Current hierarchy: **Morin Steve & Morton Claxton → H M C Bridge Company → Shady Grove 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Douglas Terry R → Shady Grove Mine; 1985-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morin Steve & Morton Claxton Et Al → Shady Grove Mine; 1991-06-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Prospect Mining Company → Shady Grove Mine; 1991-09-01 to 1992-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Douglas Terry R → Prospect Mining Company; 1991-09-01 to 1992-01-31; source msha-controller-operator-history
- **operator_operates_mine:** H M C Bridge Company → Shady Grove Mine; 1992-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morin Steve & Morton Claxton Et Al → H M C Bridge Company; 1992-02-01 to current/open; source msha-controller-operator-history