# Relationship history for MSHA mine 0203135

Current hierarchy: **Maurice R  Tanner Jr → M R TANNER MINING INC → PORTABLE PLANT #2**

- 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:** Maurice R  Tanner Jr → PORTABLE PLANT #2; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M R TANNER MINING INC → PORTABLE PLANT #2; 2006-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maurice R  Tanner Jr → M R TANNER MINING INC; 2006-07-25 to current/open; source msha-controller-operator-history