Your questions go far beyond your original identification request.
As stated before it is quite common for button designs to be different from other designs used by the company.
Marketing departments are a recent invention. Different people in a company may have sent logos to various manufacturers (of trams and buttons).
Logos on tramway carriages follow fashion and change over time. Button designs do not always follow fashion trends.
If a button manufacturer did not receive a logo (or a competitor's button), they designed the button themselves.
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