# Relationship history for MSHA mine 1515438

Current hierarchy: **Elliott Gary → Amy Coal Company → No 2**

- 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:** Helton Beve Et Al → No 2; 1984-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & B Mining → No 2; 1985-11-01 to 1989-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Helton Beve Et Al → J & B Mining; 1985-11-01 to 1989-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Elliott Gary Et Al → No 2; 1988-11-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Epperson Coal → No 2; 1989-02-03 to 1989-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Epperson Bob-Charlie Mills Et Al → No 2; 1989-02-03 to 1989-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Epperson Bob-Charlie Mills Et Al → Epperson Coal; 1989-02-03 to 1989-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Matt Coal → No 2; 1989-07-26 to 1990-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Mills Matthew-Roger Smith Et Al → No 2; 1989-07-26 to 1990-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Mills Matthew-Roger Smith Et Al → Matt Coal; 1989-07-26 to 1990-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Amy Coal Company → No 2; 1990-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elliott Gary Et Al → Amy Coal Company; 1990-04-03 to current/open; source msha-controller-operator-history