# Relationship history for MSHA mine 2200581

Current hierarchy: **Ammonia Hold Inc → Super Dry Industries Inc → SUPER DRY INDUSTRIES, 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:** Presley Oil Soak Inc → SUPER DRY INDUSTRIES, INC.; 1986-09-01 to 1992-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Hubbard  Presley → SUPER DRY INDUSTRIES, INC.; 1986-09-01 to 1992-08-11; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Hubbard  Presley → Presley Oil Soak Inc; 1986-09-01 to 1992-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Super Dry Industries Inc → SUPER DRY INDUSTRIES, INC.; 1992-08-12 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_mine:** C H  Thomas Jr → SUPER DRY INDUSTRIES, INC.; 1992-08-12 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_operator:** C H  Thomas Jr → Super Dry Industries Inc; 1992-08-12 to 1998-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Super Dry Industries Inc → SUPER DRY INDUSTRIES, INC.; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ammonia Hold Inc → SUPER DRY INDUSTRIES, INC.; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ammonia Hold Inc → Super Dry Industries Inc; 1998-05-01 to current/open; source msha-controller-operator-history