# Relationship history for MSHA mine 1001817

Current hierarchy: **George L Collingham Jr → Owyhee Calcium Inc → OWYHEE CALCIUM INC**

- 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:** Owyhee Calcium Products Inc → OWYHEE CALCIUM INC; 1988-02-01 to 1998-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Harry  Melton → OWYHEE CALCIUM INC; 1988-02-01 to 1998-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Harry  Melton → Owyhee Calcium Products Inc; 1988-02-01 to 1998-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Owyhee Calcium Inc → OWYHEE CALCIUM INC; 1998-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George L Collingham Jr → OWYHEE CALCIUM INC; 1998-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George L Collingham Jr → Owyhee Calcium Inc; 1998-12-01 to current/open; source msha-controller-operator-history