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RTL Function
In Transistor Component Circuits IBM informs us in RTL, “The logical function is performed by the input resistor network and the invert (a.k.a. “NOT”) function is accomplished by he common emitter transistor configuration.”

Books
A detailed treatment with applications is found in Lancaster.

The Digital Logic Handbook

Design information for discrete RTL gate and flip-flop circuits can be found in the GE Transistor Manual, 7ed, pages 139 through 204.

Design of Transistorized Circuits for Digital Computers

Principles of Digital Logic

IBM 1401 Customer Engineer Drawings

TX-0 Computer Circuitry

Form 223-6889-Transistor Component Circuits

TX-2 Computer Circuitry

IBM Standard Modular System SMS Cards