# Relationship history for MSHA mine 1509873

Current hierarchy: **Andalex Resources B V → Tower Resources Inc → Horton 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

- **operator_operates_mine:** Cyclone Coal Corp → Horton Tipple; 1976-08-01 to 1978-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Lane L Robert Et Al → Horton Tipple; 1976-08-01 to 1978-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Lane L Robert Et Al → Cyclone Coal Corp; 1976-08-01 to 1978-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Tower Resources Inc → Horton Tipple; 1978-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andalex Resources B V → Horton Tipple; 1978-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andalex Resources B V → Tower Resources Inc; 1978-07-28 to current/open; source msha-controller-operator-history