Thanks for the numerous Locks El-Monty, and sorry for the slow reply; I've been away for the last 48 hours.
I'll start with the two easier ones below, but I'm struggling a bit with 400E and think another puzzler might have now cracked this one.
To complete the full names for other the Locks though, here goes:
400G: Vetrya e-VIAL digital city car from Italy.
400P: Thalia, made by LM & TM in Mexico, with this EV version of the three models available being the Citadino (City), with the other two being the Pick-Up and Convertible.
For 400H, I've found various other model names, but is the HTM-Japan Corporation (part of the Plan Co. Ltd) the maker's name you are looking for? The model could be the 'mini miniature mobility Boom Car.'