# Relationship history for MSHA mine 4606079

Current hierarchy: **Graybeal Carl N → Graybeals Indian Creek Coal Company Inc → Keystone No 3e**

- 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:** Graybeal Carl N Et Al → Keystone No 3e; 1978-10-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Faith Partner Mining Company → Keystone No 3e; 1979-12-01 to 1980-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Kennedy Marvin → Keystone No 3e; 1979-12-01 to 1980-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Kennedy Marvin → Faith Partner Mining Company; 1979-12-01 to 1980-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Graybeals Indian Creek Coal Company Inc → Keystone No 3e; 1980-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graybeal Carl N Et Al → Graybeals Indian Creek Coal Company Inc; 1980-03-27 to current/open; source msha-controller-operator-history