# Relationship history for MSHA mine 1511398

Current hierarchy: **Carriker Frank → C & M Coal Consulting Company Inc → 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:** K C Equipment Company → No 1 Surface; 1978-06-01 to 1979-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Frazier Gary L → No 1 Surface; 1978-06-01 to 1979-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Frazier Gary L → K C Equipment Company; 1978-06-01 to 1979-03-15; source msha-controller-operator-history
- **operator_operates_mine:** C & M Coal Consulting Company Inc → No 1 Surface; 1979-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carriker Frank → No 1 Surface; 1979-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carriker Frank → C & M Coal Consulting Company Inc; 1979-03-16 to current/open; source msha-controller-operator-history