# Relationship history for MSHA mine 3002315

Current hierarchy: **BTR PLC → Tilcon Quarries New York Inc → Kingston Mill**

- 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:** Boyle Jay B → Kingston Mill; 1978-04-01 to 1981-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Hudson Cement Company → Kingston Mill; 1978-11-01 to 1979-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Hudson Cement Company → Kingston Mill; 1978-11-01 to 1979-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Hudson Cement Company → Hudson Cement Company; 1978-11-01 to 1979-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Hudson River Aggregates Inc → Kingston Mill; 1979-08-01 to 1981-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Boyle Jay B → Hudson River Aggregates Inc; 1979-08-01 to 1981-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Tilcon Quarries New York Inc → Kingston Mill; 1981-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** BTR PLC → Kingston Mill; 1981-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BTR PLC → Tilcon Quarries New York Inc; 1981-01-26 to current/open; source msha-controller-operator-history