# Relationship history for MSHA mine 1202068

Current hierarchy: **John M  Hanley → Dennis Trucking Company Inc → 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

- **operator_operates_mine:** Dennis Trucking Company Inc → PLANT #1; 1990-04-01 to 1993-07-25; source msha-controller-operator-history
- **controller_controls_mine:** John R  Dennis → PLANT #1; 1990-04-01 to 1993-07-25; source msha-controller-operator-history
- **controller_controls_operator:** John R  Dennis → Dennis Trucking Company Inc; 1990-04-01 to 1993-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Dennis Trucking Company Inc → PLANT #1; 1993-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Hanley → PLANT #1; 1993-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Hanley → Dennis Trucking Company Inc; 1993-07-26 to current/open; source msha-controller-operator-history