# Relationship history for MSHA mine 4202353

Current hierarchy: **Bill  Gaines → Monument Resources → Portable #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Gaines Trucking → Portable #1; 2002-07-30 to 2004-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Gaines → Portable #1; 2002-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Gaines → Gaines Trucking; 2002-07-30 to 2004-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Monument Resources → Portable #1; 2004-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Gaines et al → Portable #1; 2004-09-16 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Gaines et al → Monument Resources; 2004-09-16 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Wayland  Lafont et al → Monument Resources; 2004-09-16 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Gaines → Portable #1; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Gaines → Monument Resources; 2014-01-01 to current/open; source msha-controller-operator-history