# Relationship history for MSHA mine 1514856

Current hierarchy: **Johnson James → J & M Leasing Inc → #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

- **operator_operates_mine:** Harlan Wallins Coal Company Inc → #1; 1984-09-01 to 1988-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Robbins Gus D → #1; 1984-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robbins Gus D → Harlan Wallins Coal Company Inc; 1984-09-01 to 1988-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Brock Larry W → #1; 1987-02-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lad Enterprises Inc → #1; 1988-01-06 to 1988-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Roby Donald A → #1; 1988-01-06 to 1988-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Roby Donald A → Lad Enterprises Inc; 1988-01-06 to 1988-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Blue Ridge Coal Company → #1; 1988-04-07 to 1989-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Brock Larry W → Blue Ridge Coal Company; 1988-04-07 to 1989-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Wallins Coal Company Inc → #1; 1989-03-02 to 1989-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Robbins Gus D → Harlan Wallins Coal Company Inc; 1989-03-02 to 1989-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Dass Coal Company Inc → #1; 1989-08-11 to 1991-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Duncan Robert → #1; 1989-08-11 to 1991-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Duncan Robert → Dass Coal Company Inc; 1989-08-11 to 1991-02-04; source msha-controller-operator-history
- **operator_operates_mine:** J & M Leasing Inc → #1; 1991-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson James → #1; 1991-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson James → J & M Leasing Inc; 1991-02-05 to current/open; source msha-controller-operator-history