For all of his street pictures, Ruggero Rugarli relied on his loyal Leica M3, then switched to a Reflex R5 in the 70's.
The simplicity of the 50mm lens and the high sensitivity films would allow him to merge easily in the crowd and avoid using the flash.
Black and white adds to the impressive framing precision. Each picture is the result of only one shot reflecting the absolute exactness of the photographer's eye.
Also, Ruggero Rugarli hardly ever cropped his pictures while printing the negatives.