# Relationship history for MSHA mine 1516719

Current hierarchy: **Davidson Larry-Tommy Skidmore → Brownhorse Mining → #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:** Hembree Robert → #1; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Granny Rose Coal Company → #1; 1989-09-01 to 1991-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Hembree Robert → Granny Rose Coal Company; 1989-09-01 to 1991-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Old Timer Coal Company → #1; 1991-03-15 to 1991-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Mc Donald Michael-Jack Smith Et Al → #1; 1991-03-15 to 1991-08-18; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donald Michael-Jack Smith Et Al → Old Timer Coal Company; 1991-03-15 to 1991-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Brownhorse Mining → #1; 1991-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davidson Larry-Tommy Skidmore Et Al → #1; 1991-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davidson Larry-Tommy Skidmore Et Al → Brownhorse Mining; 1991-08-19 to current/open; source msha-controller-operator-history