I noticed that the Wheelock WS-24, Notifier NWS-24, and System Sensor SS-24 and SS24LO all have the same current draw (25 mA), and the SS24LO and WS-24 are both rated for 1.5 candela. Also, the SS24M has the same current draw (75 mA) and candela rating (15) as the WH-24. Did these early Notifier and System Sensor strobes have internal hardware outsourced from Wheelock?