self-contained, temperature sensing devices for sensing ambient air temperature over a pre-selected temperature range including the freezing temperatures and mountable adjacent a surface for monitoring the temperature thereat and signalling by means of reflective colors the sensed temperatures by displaying one of two colors or a mixture of the two colors and thereby signals either freezing temperatures, above freezing temperatures, or transition temperatures, between freezing and above freezing

'adjac':25 'air':10 'ambient':9 'color':39,48,55 'contain':3 'devic':6 'display':44 'either':59 'freez':21,60,63,69,72 'includ':19 'mean':36 'mixtur':51 'monitor':29 'mountabl':24 'one':45 'pre':15 'pre-select':14 'rang':18 'reflect':38 'select':16 'self':2 'self-contain':1 'sens':5,8,41 'signal':34,58 'surfac':27 'temperatur':4,11,17,22,31,42,61,64,67 'thereat':32 'therebi':57 'transit':66 'two':47,54

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