# Relationship history for MSHA mine 0202728

Current hierarchy: **Maurice R  Tanner Jr → M.R. Tanner Mining, Inc. → Portable Plant #1**

- 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:** Harley  Gray Jr → Portable Plant #1; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M R Tanner Mining Inc → Portable Plant #1; 1997-10-01 to 1999-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Maurice R  Tanner Jr → Portable Plant #1; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maurice R  Tanner Jr → M R Tanner Mining Inc; 1997-10-01 to 1999-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Drake Stone Products Inc → Portable Plant #1; 1999-09-01 to 2005-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Harley  Gray Jr → Drake Stone Products Inc; 1999-09-01 to 2005-03-31; source msha-controller-operator-history
- **operator_operates_mine:** M.R. Tanner Mining, Inc. → Portable Plant #1; 2005-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maurice R  Tanner Jr → M.R. Tanner Mining, Inc.; 2005-04-01 to current/open; source msha-controller-operator-history