# Relationship history for MSHA mine 2601132

Current hierarchy: **Drimmer Harold L → Mt Hope Mining Corp → Mt Hope Mill**

- 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:** Oxbow Tungsten Mines Inc → Mt Hope Mill; 1950-01-01 to 1977-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Oxbow Tungsten Mines Inc → Mt Hope Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oxbow Tungsten Mines Inc → Oxbow Tungsten Mines Inc; 1950-01-01 to 1977-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Mt Hope Mining Corp → Mt Hope Mill; 1977-11-16 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Drimmer Harold L → Mt Hope Mill; 1977-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drimmer Harold L → Mt Hope Mining Corp; 1977-11-16 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Escor Inc → Mt Hope Mill; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T G M Corp → Mt Hope Mill; 1979-02-01 to 1981-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Escor Inc → T G M Corp; 1979-02-01 to 1981-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Mt Hope Mining Corp → Mt Hope Mill; 1981-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drimmer Harold L → Mt Hope Mining Corp; 1981-03-18 to current/open; source msha-controller-operator-history