# Relationship history for MSHA mine 2000065

Current hierarchy: **Carmeuse Holding SA → Drummond Dolomite, Inc. → Drummond Dolomite, Inc.**

- 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:** Drummond Dolomite Inc → Drummond Dolomite, Inc.; 1950-01-01 to 1988-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Bethlehem Steel Corp → Drummond Dolomite, Inc.; 1950-01-01 to 1988-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Bethlehem Steel Corp → Drummond Dolomite Inc; 1950-01-01 to 1988-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Jerome  Osborne et al → Drummond Dolomite, Inc.; 1987-03-01 to 2016-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Drummond Dolomite, Inc. → Drummond Dolomite, Inc.; 1988-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome  Osborne et al → Drummond Dolomite, Inc.; 1988-10-25 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Drummond Dolomite, Inc.; 2016-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Drummond Dolomite, Inc.; 2016-04-01 to current/open; source msha-controller-operator-history