Second master was a rating introduced into the Royal Navy in 1753 that indicated a deputy master on third-rate ships of the line or larger.

Power scaling of a pico-second Nd:YVO4 master-oscillator power amplifier with a phase-conjugate mirror
ENMG appliquée à la pathologie (Second Master Médecine)
Microcomputer system with at least first and second microcomputers each operable in master and slave modes with configurable bus acc...
Second Degree Prelicensure Master's Graduates: What Attracts Them to Nursing, Their Views on the Profession, and Their Contributions
Scheduling Second-Order Computational Load in Master-Slave Paradigm
Exact time evolution and second-order quantum master equations for two interacting qubits
Servo system controlled by master and second processors through memory being accessed for read and write by processors in separate p...
Narrow bandwidth, pico-second, optical parametric oscillator-master oscillator power amplifier system and method of operation of same
An LMI approach to H∞ synchronization of second-order neutral master-slave systems
Flat Disc Phonographs and the Injunction of the Second Master