On Apr 19, 4:52*pm, Andy wrote:
I suppose I only care because I used to tow with one.


But wait - there's more....

Note the bit on multiple airworthiness certs for ag ops - nothing
about glider towing

Certification Basis Part 23 of the Federal Aviation Regulations dated
February 1, 1965, as amended
by 23-1 and 23-6 (Normal and Acrobatic Category); and
FAR 36, amended thru 39-24, for Model 8KCAB
FAR 36, amended thru 36-9, for Model 8GCBC.
FAR 36, amended thru 36-24, for Model 8GCBC with MT-Propeller.
Part 21.25 of the Federal Aviation Regulations dated February 1, 1965
(Restricted Category), for Model 8GCBC aircraft (S/N 129-75, 135-75
and up). S/N 129-75, 135-75 and up are eligible for Multiple
Airworthiness Certification in the Restricted Category when
agricultural spray equipment is installed per Bellanca Drawing 7-1492.