# Relationship history for MSHA mine 2600974

Current hierarchy: **Vining W E → W E Vining Company Inc → Manhattan Mine**

- 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:** Houston Oil & Minerals Corp → Manhattan Mine; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Houston Oil & Minerals Corp → Manhattan Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houston Oil & Minerals Corp → Houston Oil & Minerals Corp; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Vining W E → Manhattan Mine; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tenneco Inc → Manhattan Mine; 1979-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W E Vining Company Inc → Manhattan Mine; 1979-10-01 to 1983-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Vining W E → W E Vining Company Inc; 1979-10-01 to 1983-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Tenneco Minerals Company → Manhattan Mine; 1983-03-21 to 1985-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Tenneco Inc → Tenneco Minerals Company; 1983-03-21 to 1985-02-04; source msha-controller-operator-history
- **operator_operates_mine:** W E Vining Company Inc → Manhattan Mine; 1985-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vining W E → W E Vining Company Inc; 1985-02-05 to current/open; source msha-controller-operator-history