Rules
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Only in the specific scenario of being on a phone call. Historically a perfectly normal sentence in other contexts.
Even in the communications context. We've had two-way radio comms for a really long time. Walkie-talkies have been around for almost 90 years.
You're right, while it was less common than today, it would have made sense in some contexts.
10 codes are from the 30s. 10-20 is where are you.
Only in the specific scenario of being on a phone call. Historically a perfectly normal sentence in other contexts.
Even in the communications context. We've had two-way radio comms for a really long time. Walkie-talkies have been around for almost 90 years.
You're right, while it was less common than today, it would have made sense in some contexts.
10 codes are from the 30s. 10-20 is where are you.