# Relationship history for MSHA mine 4502152

Current hierarchy: **Kristin  Ayling; Raye  Evans → Tunnel Hill Granite LLC → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Bill Willworth-Allen Boyd-Leo Mille → PORTABLE 1; 1950-01-01 to 1983-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Willworht Bill-Allen Boyd & Leo Mille → PORTABLE 1; 1950-01-01 to 1983-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Willworht Bill-Allen Boyd & Leo Mille → Bill Willworth-Allen Boyd-Leo Mille; 1950-01-01 to 1983-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Tunnel Hill Granite LLC → PORTABLE 1; 1983-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald B  Coleman → PORTABLE 1; 1983-06-28 to 2013-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Donald B  Coleman → Tunnel Hill Granite LLC; 1983-06-28 to 2013-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Kristin  Ayling et al → PORTABLE 1; 2013-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kristin  Ayling et al → Tunnel Hill Granite LLC; 2013-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raye  Evans et al → Tunnel Hill Granite LLC; 2013-08-30 to current/open; source msha-controller-operator-history