# Relationship history for MSHA mine 1516704

Current hierarchy: **Delorey John → Mt Henry Coal Company Inc → Mine #1**

- 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:** Vires Darrell & Leo → Mine #1; 1982-09-01 to 2001-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Mt Henry Coal Company Inc → Mine #1; 1989-08-01 to 1991-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Delorey John → Mine #1; 1989-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delorey John → Mt Henry Coal Company Inc; 1989-08-01 to 1991-10-02; source msha-controller-operator-history
- **operator_operates_mine:** East Kentucky Coal Inc → Mine #1; 1991-10-03 to 1991-12-17; source msha-controller-operator-history
- **controller_controls_mine:** Grigsby Lewis & Fred Baker → Mine #1; 1991-10-03 to 1991-12-17; source msha-controller-operator-history
- **controller_controls_operator:** Grigsby Lewis & Fred Baker → East Kentucky Coal Inc; 1991-10-03 to 1991-12-17; source msha-controller-operator-history
- **operator_operates_mine:** Mt Henry Coal Company Inc → Mine #1; 1991-12-18 to 1992-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Delorey John → Mt Henry Coal Company Inc; 1991-12-18 to 1992-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Link Coal Company → Mine #1; 1992-02-03 to 1992-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Sheffer Bill-Carson Sizemore Et Al → Mine #1; 1992-02-03 to 1992-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Sheffer Bill-Carson Sizemore Et Al → Link Coal Company; 1992-02-03 to 1992-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Mt Henry Coal Company Inc → Mine #1; 1992-03-30 to 1993-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Delorey John → Mt Henry Coal Company Inc; 1992-03-30 to 1993-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Vires Coal Sales Inc → Mine #1; 1993-07-08 to 1994-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Vires Darrell & Leo → Vires Coal Sales Inc; 1993-07-08 to 1994-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Mt Henry Coal Company Inc → Mine #1; 1994-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delorey John → Mt Henry Coal Company Inc; 1994-02-11 to current/open; source msha-controller-operator-history