# Relationship history for MSHA mine 1515679

Current hierarchy: **Homer  Short → Homer Short Company Inc → #1 Tipple**

- 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:** Homer  Short → #1 Tipple; 1980-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Homer Short Company Inc → #1 Tipple; 1986-07-01 to 1991-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Homer  Short → Homer Short Company Inc; 1986-07-01 to 1991-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Eagle River Coal Company Inc → #1 Tipple; 1991-07-08 to 1993-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Leckie → #1 Tipple; 1991-07-08 to 1993-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Leckie → Eagle River Coal Company Inc; 1991-07-08 to 1993-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Homer Short Company Inc → #1 Tipple; 1993-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Homer  Short → Homer Short Company Inc; 1993-07-28 to current/open; source msha-controller-operator-history