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BID 770 is on the right with a Model 40 (center) for off-line encryption/decryption. It was a British built crypto machine and was used by Canada's foreign service communicators at smaller diplomatic missions to communicate with various government departments.
TENEC was the unclassified code name used by External Affairs Canada for the following hardware configuration: BID-770/TTB-77/Teletype Model 40 /Model 28 tape reader.
TOPIC was the British classified code word
for the BID770. TOPIC in its UK usage was intended to be used on-line.
In External Affairs it was used off-line.