# Relationship history for MSHA mine 1506228

Current hierarchy: **El Paso Energy Corp → Apache Mining Company → No 7 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

- **controller_controls_mine:** New Era Resources Inc → No 7 Mine; 1950-01-01 to 1978-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Moore Mining Co Inc → No 7 Mine; 1950-01-01 to 1974-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Trivette Charles F → No 7 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trivette Charles F → Tri-Moore Mining Co Inc; 1950-01-01 to 1974-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Apache Mining Company → No 7 Mine; 1974-06-02 to 1978-06-15; source msha-controller-operator-history
- **controller_controls_operator:** New Era Resources Inc → Apache Mining Company; 1974-06-02 to 1978-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Apache Mining Company → No 7 Mine; 1978-06-16 to 1980-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Global Energy Resources Inc → No 7 Mine; 1978-06-16 to 1980-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Global Energy Resources Inc → Apache Mining Company; 1978-06-16 to 1980-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Apache Mining Company → No 7 Mine; 1980-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → No 7 Mine; 1980-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Apache Mining Company; 1980-02-05 to current/open; source msha-controller-operator-history