Printing types. Type family 'Piskariovskaya' (for Russian, Ukrainian and Byelorussian alphabets). Range of application. Design. Base line. Characters per 4 picas
State system for ensuring the uniformity of measurements. Reference gauge-blocks of the 1st and the 2nd accuracy orders and working gauge-blocks of 00 and 0 accuracy classes up to 1000 mm. Methods and means for verification