# Relationship history for MSHA mine 3003341

Current hierarchy: **Robert P  Coughlin → RPC Resources, llc → Myer's Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** C Thomas  Chilewski → Myer's Quarry; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** RPC Resources LLC → Myer's Quarry; 2000-03-01 to 2016-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Robert P  Coughlin → Myer's Quarry; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Coughlin → RPC Resources LLC; 2000-03-01 to 2016-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Chilewski Flagstone → Myer's Quarry; 2016-12-07 to 2019-12-17; source msha-controller-operator-history
- **controller_controls_operator:** C Thomas  Chilewski → Chilewski Flagstone; 2016-12-07 to 2019-12-17; source msha-controller-operator-history
- **operator_operates_mine:** RPC Resources, llc → Myer's Quarry; 2019-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Coughlin → RPC Resources, llc; 2019-12-18 to current/open; source msha-controller-operator-history