# Relationship history for MSHA mine 3608876

Current hierarchy: **Naceville Materials Inc; Haines & Kibblehouse Inc → HMMK LLC → Foster Materials**

- 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

- **operator_operates_mine:** Schuylkill Contracting Company → Foster Materials; 2001-04-01 to 2004-07-06; source msha-controller-operator-history
- **controller_controls_mine:** James V  Ryan Jr → Foster Materials; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James V  Ryan Jr → Schuylkill Contracting Company; 2001-04-01 to 2004-07-06; source msha-controller-operator-history
- **operator_operates_mine:** HMMK LLC → Foster Materials; 2004-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Haines & Kibblehouse Inc et al → Foster Materials; 2004-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haines & Kibblehouse Inc et al → HMMK LLC; 2004-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Naceville Materials Inc  et al → HMMK LLC; 2004-07-07 to current/open; source msha-controller-operator-history