# Relationship history for MSHA mine 4604918

Current hierarchy: **Mower Lumber Company → Newera Resources Corp → Preparation Plant**

- 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:** New Era Resources Inc → Preparation Plant; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_mine:** New Era Resources Inc → Preparation Plant; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_operator:** New Era Resources Inc → New Era Resources Inc; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **operator_operates_mine:** New Era Resources Inc → Preparation Plant; 1978-06-01 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Global Energy Resources Inc → Preparation Plant; 1978-06-01 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Global Energy Resources Inc → New Era Resources Inc; 1978-06-01 to 1979-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Coal Company Inc → Preparation Plant; 1979-02-01 to 1983-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Ingram Industries → Preparation Plant; 1979-02-01 to 1983-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Ingram Industries → Ingram Coal Company Inc; 1979-02-01 to 1983-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Newera Resources Corp → Preparation Plant; 1983-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mower Lumber Company → Preparation Plant; 1983-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mower Lumber Company → Newera Resources Corp; 1983-06-15 to current/open; source msha-controller-operator-history