# Relationship history for MSHA mine 3600840

Current hierarchy: **Robindale Energy Services Inc → Robindale Energy Services, Inc. → Robindale Energy - Mine 33**

- 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:** Beth Energy Mines Inc → Robindale Energy - Mine 33; 1950-01-01 to 2001-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Bethlehem Steel Corp → Robindale Energy - Mine 33; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bethlehem Steel Corp → Beth Energy Mines Inc; 1950-01-01 to 2001-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Robindale Energy Services, Inc. → Robindale Energy - Mine 33; 2001-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robindale Energy Services Inc → Robindale Energy - Mine 33; 2001-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robindale Energy Services Inc → Robindale Energy Services, Inc.; 2001-06-11 to current/open; source msha-controller-operator-history