Tom and Dee,
I'm not sure Tom's assessment that Record (151 bcd) inner rings were only marked with the <C> symbol and nothing else. I've checked the 44T (151) ring on my 1962 Masi, and it is marked "Patent Campagnolo" My spare NOS 44T ring (aka retirement fund) is also marked Patent. The 42T (144) ring on my 1978 Benotto is marked "Patent," while the spare is marked "Brev."
Michael Allison
New York, NY