# Relationship history for MSHA mine 1507205

Current hierarchy: **T W Oil Inc → Kyle Coal Company → No 1 Surface**

- 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

- **operator_operates_mine:** Kyle Coal Inc → No 1 Surface; 1974-07-01 to 1975-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Jones Harold E → No 1 Surface; 1974-07-01 to 1975-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Jones Harold E → Kyle Coal Inc; 1974-07-01 to 1975-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Kyle Coal Company → No 1 Surface; 1975-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** T W Oil Inc → No 1 Surface; 1975-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T W Oil Inc → Kyle Coal Company; 1975-11-24 to current/open; source msha-controller-operator-history