# Relationship history for MSHA mine 1800711

Current hierarchy: **Hardesty John R Jr-Larry A Myers → Preston Energy Inc → Sugar Iii**

- 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:** Hardesty John R Jr-Larry A Myers Et Al → Sugar Iii; 1974-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preston Energy Inc → Sugar Iii; 1985-09-01 to 1992-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Hardesty John R Jr-Larry A Myers Et Al → Preston Energy Inc; 1985-09-01 to 1992-10-20; source msha-controller-operator-history
- **operator_operates_mine:** Maco L L C → Sugar Iii; 1992-10-21 to 1994-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Genesis Inc & Steven B Polce → Sugar Iii; 1992-10-21 to 1994-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Genesis Inc & Steven B Polce → Maco L L C; 1992-10-21 to 1994-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Preston Energy Inc → Sugar Iii; 1994-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hardesty John R Jr-Larry A Myers Et Al → Preston Energy Inc; 1994-04-08 to current/open; source msha-controller-operator-history