# Relationship history for MSHA mine 1516712

Current hierarchy: **Mason Jerry → Blue Shale Mining 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:** Morris Jim → #1; 1989-05-29 to 1990-03-08; source msha-controller-operator-history
- **operator_operates_mine:** J & J Coal Company → #1; 1989-09-01 to 1990-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Morris Jim → J & J Coal Company; 1989-09-01 to 1990-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Rickett Branch Mining → #1; 1990-03-09 to 1990-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Walters Jeff Et Al → #1; 1990-03-09 to 1990-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Walters Jeff Et Al → Rickett Branch Mining; 1990-03-09 to 1990-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Rickett Branch Mining → #1; 1990-04-17 to 1991-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Lanham Harvey Et Al → #1; 1990-04-17 to 1991-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Lanham Harvey Et Al → Rickett Branch Mining; 1990-04-17 to 1991-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Blue Shale Mining Company → #1; 1991-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mason Jerry Et Al → #1; 1991-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mason Jerry Et Al → Blue Shale Mining Company; 1991-02-27 to current/open; source msha-controller-operator-history