# Relationship history for MSHA mine 4101283

Current hierarchy: **Gresham L C Jr → Henderson Clay Products Inc → Ferris Pits**

- 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:** Gresham L C Jr → Ferris Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Reliance Clay Products Company → Ferris Pits; 1950-01-01 to 1982-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Reliance Industries Inc → Ferris Pits; 1950-01-01 to 1982-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Reliance Industries Inc → Reliance Clay Products Company; 1950-01-01 to 1982-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Henderson Clay Products Inc → Ferris Pits; 1982-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gresham L C Jr → Henderson Clay Products Inc; 1982-10-08 to current/open; source msha-controller-operator-history