# Relationship history for MSHA mine 1508166

Current hierarchy: **Coal Equity Inc → Coal Equity Inc → Placer Processing Plant #1**

- 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:** W H  Littan → Placer Processing Plant #1; 1973-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boyd County Coal Co → Placer Processing Plant #1; 1975-03-31 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_operator:** W H  Littan → Boyd County Coal Co; 1975-03-31 to 1978-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Placer Coal Inc → Placer Processing Plant #1; 1978-03-01 to 2001-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Placer Dome Inc → Placer Processing Plant #1; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Placer Dome Inc → Placer Coal Inc; 1978-03-01 to 2001-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Coal Equity Inc → Placer Processing Plant #1; 2001-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coal Equity Inc → Placer Processing Plant #1; 2001-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Equity Inc → Coal Equity Inc; 2001-11-19 to current/open; source msha-controller-operator-history