# Relationship history for MSHA mine 1514171

Current hierarchy: **Andrew J  Leckie → Ravencliff Coal Company Inc → #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:** Puma Corp → #1 Surface; 1983-08-01 to 1984-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Heizman Richard → #1 Surface; 1983-08-01 to 1984-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Heizman Richard → Puma Corp; 1983-08-01 to 1984-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Ravencliff Coal Company Inc → #1 Surface; 1984-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Leckie → #1 Surface; 1984-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Leckie → Ravencliff Coal Company Inc; 1984-08-31 to current/open; source msha-controller-operator-history