# Relationship history for MSHA mine 1513970

Current hierarchy: **Drinnon Nathan → Double D Coal Company → #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:** Warfield Larry & Tommy Gambrel Et Al → #1; 1982-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoney Fork Mining → #1; 1983-03-01 to 1988-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Warfield Larry & Tommy Gambrel Et Al → Stoney Fork Mining; 1983-03-01 to 1988-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Pencil Mark Coal Company → #1; 1988-09-01 to 1989-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Elswick Gregory T → #1; 1988-09-01 to 1989-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Elswick Gregory T → Pencil Mark Coal Company; 1988-09-01 to 1989-05-10; source msha-controller-operator-history
- **operator_operates_mine:** B & B Coal Company → #1; 1989-05-11 to 1989-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Lake Arvil Et Al → #1; 1989-05-11 to 1989-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Lake Arvil Et Al → B & B Coal Company; 1989-05-11 to 1989-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Block Coal Corp → #1; 1989-07-12 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Elswick Gregory T → #1; 1989-07-12 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Elswick Gregory T → Block Coal Corp; 1989-07-12 to 1991-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Double D Coal Company → #1; 1991-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Drinnon Nathan Et Al → #1; 1991-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drinnon Nathan Et Al → Double D Coal Company; 1991-06-24 to current/open; source msha-controller-operator-history