# Relationship history for MSHA mine 4003160

Current hierarchy: **Altair International Inc → Mineral Recovery Systems Inc → MRS INC., CAMDEN TN PILOT PLANT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Mineral Recovery Systems Inc → MRS INC., CAMDEN TN PILOT PLANT; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Altair International Inc → MRS INC., CAMDEN TN PILOT PLANT; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altair International Inc → Mineral Recovery Systems Inc; 2000-04-01 to current/open; source msha-controller-operator-history