# Relationship history for MSHA mine 4604271

Current hierarchy: **Hardesty John R Jr-Larry A Myers → Preston Energy Inc → Sunshine 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:** Fisher David A → Sunshine Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Development Company → Sunshine Mine; 1974-01-01 to 1977-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Fisher David A → Mineral Development Company; 1974-01-01 to 1977-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Hardesty John R Jr-Larry A Myers Et Al → Sunshine Mine; 1974-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preston Energy Inc → Sunshine Mine; 1977-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hardesty John R Jr-Larry A Myers Et Al → Preston Energy Inc; 1977-09-19 to current/open; source msha-controller-operator-history