automatic tide signalling system
...that the automatic tide signalling system at Irvine harbour, North Ayrshire, invented and patented by its harbourmaster Martin Boyd, is probably unique?
...that the <b id="mwAzI"><a href="./Boyd's_Automatic_tide_signalling_apparatus" id="mwAzM" rel="mw:WikiLink" title="Boyd's Automatic tide signalling apparatus">automatic tide signalling system</a></b> at <a href="./Irvine,_North_Ayrshire" id="mwAzQ" rel="mw:WikiLink" title="Irvine, North Ayrshire">Irvine harbour, North Ayrshire</a>, invented and patented by its harbourmaster Martin Boyd, is probably unique?