# Relationship history for MSHA mine 1510801

Current hierarchy: **Salmons Carlos → C & R Coal Company → No4**

- 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:** Preece Homer & George → No4; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preece Enterprises Inc → No4; 1977-09-01 to 1978-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Preece Homer & George → Preece Enterprises Inc; 1977-09-01 to 1978-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Maynard Coal Company Inc → No4; 1978-05-30 to 1981-01-07; source msha-controller-operator-history
- **controller_controls_mine:** David M  Maynard → No4; 1978-05-30 to 1981-01-07; source msha-controller-operator-history
- **controller_controls_operator:** David M  Maynard → Maynard Coal Company Inc; 1978-05-30 to 1981-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Salmons Carlos → No4; 1980-02-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L M B River Coal Company Inc → No4; 1981-01-08 to 1984-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Burgess David → No4; 1981-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burgess David → L M B River Coal Company Inc; 1981-01-08 to 1984-07-02; source msha-controller-operator-history
- **operator_operates_mine:** C & R Coal Company → No4; 1984-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salmons Carlos → C & R Coal Company; 1984-07-03 to current/open; source msha-controller-operator-history